Thanks so much. Did the hack yesterday on a 2002 corolla with 230,000 miles and passed inspection today. In the past, a tank of premium gas worked. but this time ng. also tried Scotty Kilmer's suggestion to add one gallon of lacquer solvent and it helped but not enough. engine light did not come on for 60 miles vs. 40 prior to. also attempted the spark plug non fouler fix but could not budge the sensor with special sockets borrowed from advance auto, breaker bar with extension, and propane. 15 years of exhaust heat and salt air at the jersey shore! just as well - i'm sure the threads on the sensor and bung hole are shot. the hack was the last shot before donating the car. And it worked! Your science info. was excellent. Googled rc circuit and capacitor and learned more. You should get an award! but don't put in for it on earth (you may end up in the pokey)- wait for heaven. oh - got 5 resistors and a capacitor for 40 cents - 90% sale at a radio shack going out of business - it just keeps getting better!!
+JOHN HIGGINS Man I am really glad to hear it worked out for you and on a Corolla. Good to hear you tried the other methods. What resistor and capacitor values did you end up using?
1.0uF(50V, 20%) capacitor and 1Megaohm (1/2 watt, 5% tolerance) resistor. Basically the same values mentioned in your vid. I didn't have choice regarding values in parantheses as I was limited to what was in stock at the store which was closing. not that it mattered because I don't know enough to know the best values.
Wow! Man you've try everything on UA-cam. Scotty Kilmer, non fouler fix and now this. I got a 2003 Corolla with 223000 miles and same issue so maybe I should just take this approach. Was going to do the gallon of lacquer solvent the if it don work then the non fouler fix but I had the same concern not being able to take the 02 sensor off and retro fit it. Car ran fine just the annoying check engine light and we don't do inspection in Minnesota.
I was pleasantly surprised that it worked and passed inspection. it has not yet been a week. i will update if light comes back on or goes 1,000 miles without coming back on. this may take a while as i have returned the car to my daughter who is currently doing limited driving. Like yours, the car runs fine but it does burn a quart of oil/month when driven ~ 1,000 miles. this may be connected to the catalytic converter malfuction/error code. so if you are considering the hack just to get rid of the light you may want to wait for my updates. if you do go ahead with it anyway, if a newbie, you should practice soldering first. it is easy but you need to take some precautions: sand the wires, use flux, and separate pieces to be soldered with pieces of sheet metal (so the solder on one connection doesn't inadvertently drip to another), and wrap with electrical tape to make sure the soldered connections do not touch each other and short. as your corolla is the next generation from my 2002 i think you may have easier access to the oxygen sensor connection by the passenger seat. once accessed, you should disconnect at the connector and strip and cut wires as shown in speedkar99's vid. there is no need to remove the oxygen sensor. all the work is can be completed in the car. i had to remove the front passenger seat and the shifter harness to get to the connector. but it seems access is easier for the 2003 model. came across this website for sensor access/removal which may prove useful to you: www.toyotanation.com/forum/132-corolla-9th-gen-1st-gen-matrix-2003-2008/1354081-diy-downstream-oxygen-sensor-replacement-2003-2008-corolla-lots-photos.html Good luck!
Update - Light came back on somewhere between 200-500 miles. but at least i passed inspection. So, Tous, I can't vouch for the hack to be effective on your 2003 corolla and your goal to eliminate the light, as inspection for emissions is not a consideration in your state.
This is a great alternative to using a non-fouler with the O2 sensor and is even cheaper! You bought all the parts with the change you found on the carpet! I'll consider this fix for my '05 Element which has the same engine. Thanks!
i got this code from a bosch o2 sensor for my toyota. i bought a denso o2 sensor and the code went away. sometimes the brand does make the difference even though it shouldn't. great video!!!
Thanks for the video! My code reader isn't as advanced as yours, and neither is my grasp on your method. After trying and failing at putting the O2 sensor in a coupling (sensor was too big) I ended up changing the spark plugs, putting in high octane gasoline and seafoam additive, erasing the 420 code and driving until all 8 monitors cleared(about 75 miles). Then I headed right to the inspection station, passed inspection, and 10 miles later the 420 code came back on. At least I got a legit inspection sticker, so I can troubleshoot further without getting a ticket. Thanks again for the video, I was intimidated until I watched you at work.
Finally, your Smoke Checked showed that "Catalyst Not Ready" and the "Catalyst Not Ready" is "Failure" of the Smoke Check in Van Nuys, California (Feb. 10, 2023) !
Hello, which bank o2 sensor did you put fouler on? I added it to bank 1 on my 2006 toy sienna n it varies from 30 miles to about 300 miles before lights come back on. Will it work better on bank 2? Or should I have it on both banks?
@@kellismith4329 i have P0420 on my honda fit 2015 . Will adding fouler on secondary o2 sensor will turn off the engine check light . Or will the light come after a period of time
@@manuvaldavis1048 if there is an issue with your converter, you may have to remove it and put pipe instead - at that point your car will show a p0420 in it’s absence, then you install the antifouler to trick it into thinking the converter is still there. Driving with a messed up converter will only get worse and can mess up the engine
0:29 Would you mind clarifying what 'orderly' means? Are we trying to limit the sensor amplitude readings, or enforce a more consistent time between peaks/troughs? I see you did both after the RC circuit was applied, but which of those effects was triggering the P0420 code? Also, any advice on how to find the Time constant for our specific vehicle, so that we can correctly choose the RC for our circuit? Or do your Resistor/Cap values work for anyone?
The catalyst will have a lot of difficulty setting the monitor, due to not responding to the computer's intentional lean/rich commands.The computer will push these limits to TEST for an appropriate response from the catalytic converter. It looks for voltages ranging from 0.10 volts, to 0,90 volts. Outside these limits indicated a failed sensor. While a "steady reading" may be desired, the computer will force the system lean and look to see that it gets the expected response. It will do the same for the rich. The bypass will prevent these results from matching what is expected, and not let the catalytic monitor to set, OR will throw catalytic converter codes or REAR oxygen sensor codes. (Hope this clarifies a bit)
I fixed the P0138 high voltage code that came on after this mod by using 1M and a 4.7uF along with another 1M resistor across the 4.7uF cap (signal to ground in the same spot as the cap). I now have a nice smooth line at about .8V and a happy ECM.
I did the mod but I have a problem now... we don't use kilometers in USA , I'll have to drive to Canada to drive a few kilometers and finalize my work .... ; )
The real fix is a new cat convertor. This is somewhat of a "band aid". But I am certainly willing to use it on my 2005 Accord with 320,000 miles. This seems to be the electronic equivalent of using a spark plug de-fouler. It's better though, because it might not be as visible when getting an inspection :) Thanks for the video.
I would modify the harness on the O2 side instead of the factory harness. It is much easier to do also since you can do the work on the bench then do the install. I hope this helps and thanks for providing the great tip on fixing this annoying check engine light.
But then your fix is easily visible to anyone. If you have a commercial vehicle and get stuck in one of those DOT roadside inspections , you are looking at a major fine and even jail depending what State you are in.
I ve replaced my O2 sensor "1" correctly with brand new oem parts. After few week , the warning light comes back again for the same problem. Is it something to do with a dirty mass air flow sensor ? i need advice to correct the problem. thank you !
@@speedkar99 i ve hacked bank 1 sensor , i m waiting for the result, no warning light at the moment. The last owner also hacked the bank 2 sensor for some reason(i don't know why). Unfortunately he did the resister on the -ve wire ,now i recorrect all his mistake.. ..Wait & see ! hope the warning lights don't come back
So I used a 1mF capacitor and a 1 M ohm resistor and my signal has a low peak and stays very close to 0.4V. I am now getting a code of 'No activity' on bank 1 and 2. Should I use a different capacitor? Thoughts?
you are getting far too low of voltage you need to lower the resistance to allow more volts to flow through, the optimum voltage is lower than 0.7 and above 0.4 volts so 0.5 or 0.6 volts is perfect
Just another person recommending this. 2013 Outback with too many km's to justify the $2000 catalytic converter replacement. This RC circuit has me seeing .52v steady when looking at an OBD scanning app on my phone. Here's hoping it works in the long term.
@@lostconciousness4255 Sadly no. For two days no CEL, then it popped up again, this time p2096 (I believe) for lean mixture. Fiddled and fiddled, finally no go. So I recently bought a new O2 sensor, currently waiting for the CEL to pop again. If it does, new cat for me.
Thanks man. After I read about how O2 sensors output data I figured that you could make a circuit board, resistor, capacitor, and power source that would mimic the sensor output. This is way easier then what I was trying to do.
i just done this on a 2003 toyota seinna. first attempt hooked up wrong. check engine light came on right away. redid it. but it took so long to go into readyness mode. but it worked. thanks
If you modify the vehicle side of the harness, if that sensor ever fails, you won’t have to rebuild the RC circuit… good explanation of how a filter circuit works…
That is the driver side but your answer didn't answer my question. Is it the first 02 sensor or the second 02 sensor. The first being by the header or the second one that is actually on the cat itself? Upstream or downstream on driver side? 05 dodge ram 1500 4.7
I put the spark plug fouler on the first one and im still getting the code. When i put it on the second one then i no longer got code but i got a new code p0133 running too slowly or something like that
I deleted my catalytic converter on my stock 2003 honda s2000. keep getting p0133 bank 1o2 sensor mostly every day within 50 - 100 miles after I erase it.. And every now and then I get a p0420 on my bank 2 o2 sensor. I'm using ram air intake. When you have time. Can you please let me know if I can try to fix my problem with your resistor/compacitor method on this video or do I need a hondata version 4 ecu and tune?if yes please tell me what size on bank1 and what size on bank 2.i really would appreciate it
Without a cat you'll always throw p0420 and you'll need a full simulator (and not just modify the existing one) As for the AF sensor that means there's an issue with your engines combustion, either a vacuum leak or busted injector.
Question.....to keep the car original, for whatever reason, even to go back to stock at some later date....instead of cutting wires..... can you buy a pair of male-female connectors....to capture the "mods" here you wish to make....with the resister and capacitor captured between the new connectors to make an "assembly"....and then plug this "assembly" to the original car's wiring harness connector on one end..... and ( on the other side of the "Assembly")....to the sensor plug?
I had p0420 after doing this yesterday for 50miles, the engine light came back and it was p2a00. Do I really need to fix the 02 sensor from bank 1 sensor 1?
1M Ohm + 1uF is way too high for the modern ECUs. This is technically an open circuit, you get a new P0138 DTC, and fix 1,28V. I tried with 330K + 1uF too, didnt worked.. Somebody wrote the correct values, but his comment has been deleted! I dont know why. 4,6K + 100uF, works like charm since 5000 miles. Many thanks for your recommendation.
Does using this fix negatively effect anything mileage/performance/reliability/longevity? I’m just saying, it’s tricking the vehicle to think everything is perfect when it really isn’t. I had MIL eliminators on my mustangs because they had no cats but they also had custom tunes installed instead of the factory programming. So with this fix you don’t need a custom tune? Thank you for your time. Great video as usual!
speedkar99 I have tried this on my 2004 Accord LX (a California vehicle) with SULEV & PZEV emissions. This only delayed the Catalyst Monitor. All monitors cleared except for the Catalyst. This stayed incomplete. After 3 drive cycles I received a CEL for Delayed 02 sensor function Bank 2. So this didn't work to clear the P420 code. In states where the Catalyst Monitor can remain incomplete this may work fine. Unfortunately in California completing this monitor is a requirement.
What about the o2 heater circuit? If the car requires heat from the cat to reach the correct temp, wouldn't the monitor hang up on the heater? Then the o2 sensor test would never run, unless your car requires a lower temp to run the heater test. In the case where the monitor hangs up on the o2 heater, what would you do?
I was referring to his mod specifically. I wasn't sure if the heaters would reach the correct temp without the cats installed. I'm guessing the heaters get hot enough for this mod to work on most vehicles, I was just throwing out the possibility of one not working without the additional heat from the cats. As for my issue (I still have cats, but this topic intrigues me anyway), I had a blown fuse that was causing all 4 o2 sensors to show a heater code, so the monitor wouldn't run.
@@speedkar99 well it's funny because I hooked up the multimeter leads to those two pins on the connector and saw the resistance rise second by second from about 6Mohm all the way up to 30Mohm and then zero at OFL lol.
it's an Electrolytic Capacitor before anyone comments.. the reason the signal is so smooth is the resistor limits the current for starters. and the capacitor acts like a controlled power source only allowing a limited current each time, by changing the capacitor you can alter the 'wave form' basic electronics.
Awesome video! It looks like in this case you would have passed the emissions test even without the fix, since the catalyst monitor still was not ready at the time of the test. I've eliminated a p0420 in a couple vehicles by putting a couple of spark plug non-foulers between the sensor and the exhaust as a spacer (it doesn't seem like it would work but it does). It's important to point out that any work-around like this is only a temporary fix; the catalytic converter should be replaced to avoid increased emissions, exhaust restriction and eventual performance issues
I agree. The only thing is cars here in Canada (mine included) are very rusty so adding the anti-foulers or replacing the catalytic converter is a bit more challenging. Eventually when the cat fails pretty badly it will produce an O2 signal that the filter can't correct and throw a code.
Ah true, didn't even consider that fact. I'm spoiled since my cars are relatively rust-free (live in the Washington D.C. area). Is there an effective undercoating available, or is just a lost cause trying to fight the rust?
Its mostly a lost cause because of the amount of salt they use on the roads here in winter. The most you can do is rust proof annually and keep washing the car after snowstorms. It also depends on the vehicle manufacturer.
Joe Milton yes, I'd like to know if the vehicle was able to pass the catalyst monitor or not, since resetting the code is separate from the addition of the RC filter. without seeing that monitor pass, it's inconclusive whether the ECU screening parameters were changed sufficiently to enable it to pass. a diode in line for a peak hold may be better if the catalyst is in worse condition than just marginal.
I don’t know if u still read this but just in case, I have a 2006 Toyota Highlander code 430 420 I did what u said with the com pastor and 1ohm r drove it 40 miles and the light came back on with the same code. What would u suggest I do?
Hi, my check engine light on today . It say catalytic converter defect . But I have change it one month ago . Anyway I erase the code and check engine light gone . So my question is will it come back again. If so how long it will take to come back. Thanks Golf 5 ( 2008 ) 1.4 patrol engine I drove with bad kat about a week but no engine light on and after I drove another week without Kat no engine light on . When I change my both Kat and drove 500km not engine light. Then I put fuel injector cleaner and drove another 150 km . And after engine light on and it says on my obd2 Kat defect.
Searching for 1 M ohm resistor now. Results comeback with more types: 1/4,1/2, 1 watt Which one should I get or it doesn’t matter I have a 2010 Prius with P0420 code as well. Thanks for your help
there may be a small leak in your exhaust system, take some soapy water and spray it over the exhaust while you have some pressure in the tail pipe(Use a vacuum on blow mode or a leaf blower). you can watch ChrisFixes latest video on how to do that. Who knows might fix the problem.
Does this work on Chrysler Town and country, I have a 2011 with p0420 bank 1 , I was thinking of trying a spacer and came across this video, any advice is appreciated
Mr ravetti, your a failure at being any kind of mechanic. Each system takes a certain amount of learn time to be considered ready from the ecu standpoint. There are things like short term and long term fuel trim, evap , ac, purge, oxygen heated air effic. And could go on.. some systems require a specific milage to be driven at exactly 30mph without decel below that speed which may take a while before a car can be driven the dustance set by mfg to do in order to ready that particular system for a self diagnosis which some systems will even say not ready or even not available. If you remove a certain component or it has a defect ive seen the system completely not recognize its installed and the system still work such as ac... if your car smokes when you drive, it doesnt always mean its burning oil. There could be a neighbors cat stuck on your tailpipe..
I have a 2018 Malibu I had code p0420 only so I switched sensors downstream to up and 3 codes came up on top. So I thought ok maybe it’s sensor Now I put new sensor on top and stupid code came back p0420 so what can it be
Curious- by doing this, will the mpg (fuel economy) and acceleration improve to normal levels? Currently with P0420, mpg and acceleration is really bad..
Hi, I have a single wire CAT O2 sensor (92 Honda), and the computer is sending 10.3Vdc to the sensor through this wir. Does this mean that the senor is just acting as a variable resistor (hence changing volts based on heat?). How can I use this DC supply of 10.3V from the computer to create a 0.4 to 0.7 V variable voltage using a RC circuit design in series? I was also looking at using ohms law to hold the voltage at a constant value of 0.5V by adding a resistor only if that works too.. Can you please help?
+Sajaad Nazim I'm not familiar enough with electronics to help, but you might want to research how a 1992 oxygen sensor works because that might be different than the newer cars
Hi, Thanks for replying. After some great research I found that this sensor on the CAT was not an O2 sensor but an Exhasut Temp. (EGT) sensor acting as a Thermistor with a negative temperature gradient. Was able to fix it by adding a 100K ohm resistor and grounding the single signal wire to the chasis. Now the computer assumes normal operating temp. and the light is gone too. Hope this helps to all who have Honda 92-95 JDM Eg hatch Models..
this circuit will slowly charge up the capacitor, taking approx. 244 minutes to load it up to 1v, giving again a bad reading. Any idea how could this be sorted out?
My mercedes sl350 after replacing o2 senso runing 50miles next day when i start the engine i get the check light with same bank 1 o2 sensor code anyone fix?
speedkar99 dang that is a long connector for that vehicle! ok that’s what I did but I must have made a mistake. I was wondering in case one of those wires is a shared connection like the EGR wiring for my 5.0 in my 01 mountaineer, in my case I need to put three resistors in basically a triangle to ensure proper outputs for the EGR that is gone and the other component that uses the shared connection. Thanks for your fast reply.
Man ... you are on another level, I bet you're an engineer, my fancy college Control proff doesn't know shit about these wiring stuff :( brilliant job bro, with some good marketing descriptions at the beginning/ending of your videos you should have at least a million subscriber in less than 6 months, you're simply incomparable with these clowns youtubers out there
Is this mod better than the spacer? or the spacer with the mini catalytic converter? will it work on something like a new BMW or Audi, ? bu new I mean like 2010 to 2015 somewhat recent.
Where do you buy those parts?Can I find those in any devices around the house like a broken Microwave or Old solid state devices?Is that more effective than the defouler that is all over Yutube?Is that legal to do in California?Thank you.
@@speedkar99 Will this work on 2009 Acura Tsx with po 420?But which converter there are two in TSX though.One in the exhaust Manifold and before the muffler.Thank you.$3,000 is the stealerships price on the one under the hood.
Thanks speedkar99. It is BANK 1 so I know which one to deal with. Just curious, does your brother know you take his used tooth brush to do cleaning? ;-) I am telling you, that portion on your other video clip was hilarious!!!
Your pass with ONE "not ready" monitor caught my attention. However, some bad news: Ontario, Canada, Readiness Changes As of October 3, 2016, readiness conditional passes will no longer be issued.
+TheAnalogKid2 thank you for letting me know. You made me dig into this further and I found out they're changing the law April 1 so you don't need emissions to register a car anymore too. More time to get this fixed!
I learnt more in this one video than the last six months of trying sort out issues with my Audi S 5 👍
Did it fix your issue?
Thanks so much. Did the hack yesterday on a 2002 corolla with 230,000 miles and passed inspection today. In the past, a tank of premium gas worked. but this time ng. also tried Scotty Kilmer's suggestion to add one gallon of lacquer solvent and it helped but not enough. engine light did not come on for 60 miles vs. 40 prior to. also attempted the spark plug non fouler fix but could not budge the sensor with special sockets borrowed from advance auto, breaker bar with extension, and propane. 15 years of exhaust heat and salt air at the jersey shore! just as well - i'm sure the threads on the sensor and bung hole are shot. the hack was the last shot before donating the car. And it worked! Your science info. was excellent. Googled rc circuit and capacitor and learned more. You should get an award! but don't put in for it on earth (you may end up in the pokey)- wait for heaven. oh - got 5 resistors and a capacitor for 40 cents - 90% sale at a radio shack going out of business - it just keeps getting better!!
+JOHN HIGGINS Man I am really glad to hear it worked out for you and on a Corolla. Good to hear you tried the other methods. What resistor and capacitor values did you end up using?
1.0uF(50V, 20%) capacitor and 1Megaohm (1/2 watt, 5% tolerance) resistor. Basically the same values mentioned in your vid. I didn't have choice regarding values in parantheses as I was limited to what was in stock at the store which was closing. not that it mattered because I don't know enough to know the best values.
Wow! Man you've try everything on UA-cam. Scotty Kilmer, non fouler fix and now this. I got a 2003 Corolla with 223000 miles and same issue so maybe I should just take this approach. Was going to do the gallon of lacquer solvent the if it don work then the non fouler fix but I had the same concern not being able to take the 02 sensor off and retro fit it. Car ran fine just the annoying check engine light and we don't do inspection in Minnesota.
I was pleasantly surprised that it worked and passed inspection. it has not yet been a week. i will update if light comes back on or goes 1,000 miles without coming back on. this may take a while as i have returned the car to my daughter who is currently doing limited driving. Like yours, the car runs fine but it does burn a quart of oil/month when driven ~ 1,000 miles. this may be connected to the catalytic converter malfuction/error code.
so if you are considering the hack just to get rid of the light you may want to wait for my updates. if you do go ahead with it anyway, if a newbie, you should practice soldering first. it is easy but you need to take some precautions: sand the wires, use flux, and separate pieces to be soldered with pieces of sheet metal (so the solder on one connection doesn't inadvertently drip to another), and wrap with electrical tape to make sure the soldered connections do not touch each other and short.
as your corolla is the next generation from my 2002 i think you may have easier access to the oxygen sensor connection by the passenger seat.
once accessed, you should disconnect at the connector and strip and cut wires as shown in speedkar99's vid. there is no need to remove the oxygen sensor. all the work is can be completed in the car. i had to remove the front passenger seat and the shifter harness to get to the connector. but it seems access is easier for the 2003 model.
came across this website for sensor access/removal which may prove useful to you:
www.toyotanation.com/forum/132-corolla-9th-gen-1st-gen-matrix-2003-2008/1354081-diy-downstream-oxygen-sensor-replacement-2003-2008-corolla-lots-photos.html
Good luck!
Update - Light came back on somewhere between 200-500 miles. but at least i passed inspection. So, Tous, I can't vouch for the hack to be effective on your 2003 corolla and your goal to eliminate the light, as inspection for emissions is not a consideration in your state.
I would have blacked out VIN data on your report, never know about the government. Great video BTW.
I bought a kit online for $20. It helped me connect to my ECU. I switched off all catalytic converter monitoring. Easy. No hardware.
source>?
This is a great alternative to using a non-fouler with the O2 sensor and is even cheaper! You bought all the parts with the change you found on the carpet! I'll consider this fix for my '05 Element which has the same engine. Thanks!
Non-fouler with the O2 sensor or 02 Sensor Spacer is not allowed to buy from California !
@@criticman5221 Didn't work for me at all. Had to buy a new downstream HO2 sensor. At least I didn't have to replace the cat!😆
Downstream sensor has to work in order for this to bypass the converter
i got this code from a bosch o2 sensor for my toyota. i bought a denso o2 sensor and the code went away. sometimes the brand does make the difference even though it shouldn't. great video!!!
Most direct mater of fact tutorial with actual examples on the subject
Awesome tutorial
Thanks glad you learned from it
Brilliant explanation on how the O2 sensor works bro you need to do more videos like this helped me understand a lot!
Thanks for the video! My code reader isn't as advanced as yours, and neither is my grasp on your method. After trying and failing at putting the O2 sensor in a coupling (sensor was too big) I ended up changing the spark plugs, putting in high octane gasoline and seafoam additive, erasing the 420 code and driving until all 8 monitors cleared(about 75 miles). Then I headed right to the inspection station, passed inspection, and 10 miles later the 420 code came back on. At least I got a legit inspection sticker, so I can troubleshoot further without getting a ticket. Thanks again for the video, I was intimidated until I watched you at work.
DEQs are bullshit any way, way to go for beating the system!
Finally, your Smoke Checked showed that "Catalyst Not Ready" and the "Catalyst Not Ready" is "Failure" of the Smoke Check in Van Nuys, California (Feb. 10, 2023) !
I'm an engineer and I FOUND THIS IMPRESSIVE SIR
Thanks
Now you try 😎
I was just about to say the same thing its rare to find videos like this
I couldn't get this to work after too many attempts with different values, so I made a spacer out of non-foulers and that worked wonderfully.
Hello, which bank o2 sensor did you put fouler on? I added it to bank 1 on my 2006 toy sienna n it varies from 30 miles to about 300 miles before lights come back on. Will it work better on bank 2? Or should I have it on both banks?
@@tomgaffney740 both banks, rear sensors only, and only if you have p0420 and/or p0430
@@kellismith4329 i have P0420 on my honda fit 2015 . Will adding fouler on secondary o2 sensor will turn off the engine check light . Or will the light come after a period of time
@@manuvaldavis1048 if there is an issue with your converter, you may have to remove it and put pipe instead - at that point your car will show a p0420 in it’s absence, then you install the antifouler to trick it into thinking the converter is still there. Driving with a messed up converter will only get worse and can mess up the engine
@@kellismith4329 if the problem is with o2 sensor, can we use fouler. Will it remove the error
0:29 Would you mind clarifying what 'orderly' means?
Are we trying to limit the sensor amplitude readings, or enforce a more consistent time between peaks/troughs? I see you did both after the RC circuit was applied, but which of those effects was triggering the P0420 code?
Also, any advice on how to find the Time constant for our specific vehicle, so that we can correctly choose the RC for our circuit? Or do your Resistor/Cap values work for anyone?
I have a 08 GMC Yukon and have changed out the catalytic converter and oxygen sensors and still getting a P0430 and P0420 codes.
The catalyst will have a lot of difficulty setting the monitor, due to not responding to the computer's intentional lean/rich commands.The computer will push these limits to TEST for an appropriate response from the catalytic converter. It looks for voltages ranging from 0.10 volts, to 0,90 volts. Outside these limits indicated a failed sensor.
While a "steady reading" may be desired, the computer will force the system lean and look to see that it gets the expected response. It will do the same for the rich. The bypass will prevent these results from matching what is expected, and not let the catalytic monitor to set, OR will throw catalytic converter codes or REAR oxygen sensor codes. (Hope this clarifies a bit)
I fixed the P0138 high voltage code that came on after this mod by using 1M and a 4.7uF along with another 1M resistor across the 4.7uF cap (signal to ground in the same spot as the cap). I now have a nice smooth line at about .8V and a happy ECM.
You are welcome
Make and model?
Can you show diagram for your job
Can you explain the second resistor part more?
I did the mod but I have a problem now... we don't use kilometers in USA , I'll have to drive to Canada to drive a few kilometers and finalize my work .... ; )
+tiz tiz haha good one.
50miles is the written word on them in the freedom land
asshole
You will one day. Just like you are usning kilograms in Hospitals.🤣🤣🤣
@ferkemall Citroën or Renault? Or Peugeot
Can something be done like this with the evap system? Specifically to bypass p0456 small leak code?
Not as easily. Better to have your ECU programmed
The real fix is a new cat convertor. This is somewhat of a "band aid". But I am certainly willing to use it on my 2005 Accord with 320,000 miles. This seems to be the electronic equivalent of using a spark plug de-fouler. It's better though, because it might not be as visible when getting an inspection :) Thanks for the video.
I would modify the harness on the O2 side instead of the factory harness. It is much easier to do also since you can do the work on the bench then do the install. I hope this helps and thanks for providing the great tip on fixing this annoying check engine light.
Yeah good luck trying to remove the Rusty sensor
But then your fix is easily visible to anyone. If you have a commercial vehicle and get stuck in one of those DOT roadside inspections , you are looking at a major fine and even jail depending what State you are in.
Ya your repair won’t last long hanging under your car though
I have a 92 3.1 rodeo with one oxygen sensor that only has one wire how do I bypass that to eliminate the code.?
I ve replaced my O2 sensor "1" correctly with brand new oem parts. After few week , the warning light comes back again for the same problem. Is it something to do with a dirty mass air flow sensor ? i need advice to correct the problem. thank you !
The catalytic converter is probably below efficiency and needs to be hacked or replaced
@@speedkar99 yes, it is the cat . i will hack it as yr method
@@speedkar99 i ve hacked bank 1 sensor , i m waiting for the result, no warning light at the moment. The last owner also hacked the bank 2 sensor for some reason(i don't know why). Unfortunately he did the resister on the -ve wire ,now i recorrect all his mistake.. ..Wait & see ! hope the warning lights don't come back
Check your wiring
So I used a 1mF capacitor and a 1 M ohm resistor and my signal has a low peak and stays very close to 0.4V. I am now getting a code of 'No activity' on bank 1 and 2. Should I use a different capacitor? Thoughts?
Yes
Johnathan Reid i used a 4.7 capicitator. Got the same errorcode p0140. Which capicitator do you advice? (Mazda 6 4 wires o2 sensor?
you are getting far too low of voltage you need to lower the resistance to allow more volts to flow through, the optimum voltage is lower than 0.7 and above 0.4 volts so 0.5 or 0.6 volts is perfect
VileStorms when i try this I’m getting error code p2271( signal stuck rich) any ideas???
Just another person recommending this. 2013 Outback with too many km's to justify the $2000 catalytic converter replacement. This RC circuit has me seeing .52v steady when looking at an OBD scanning app on my phone. Here's hoping it works in the long term.
@@lostconciousness4255 Sadly no. For two days no CEL, then it popped up again, this time p2096 (I believe) for lean mixture. Fiddled and fiddled, finally no go.
So I recently bought a new O2 sensor, currently waiting for the CEL to pop again. If it does, new cat for me.
Thanks man. After I read about how O2 sensors output data I figured that you could make a circuit board, resistor, capacitor, and power source that would mimic the sensor output. This is way easier then what I was trying to do.
+daniel evans This is if your cat is still half working (below 90% efficient)
@@speedkar99 what if i don't have a cat?
i just done this on a 2003 toyota seinna. first attempt hooked up wrong. check engine light came on right away. redid it. but it took so long to go into readyness mode. but it worked. thanks
Do you recall if you used the 1M resistor and 1 microfarad capacitor?
@@bradleysmith1064 its been awhile buy yes with a 3 watt resistor i think i used a 6.3uf capacitor 16volt
If you modify the vehicle side of the harness, if that sensor ever fails, you won’t have to rebuild the RC circuit… good explanation of how a filter circuit works…
Hello, thx for video, but how can I solve this problem on a titanium oxygen sensor? It has a different measurement procedure .. THX!
Not sure.
Same thing
What kind of code reader scanner is that I'd like to know I'd like to get one seems like a good one
Yeah
When it says bank 1. Is that the very first one that is right beside the header? Or is it the one that is on the cat.
The first set of cylinders from #1
That is the driver side but your answer didn't answer my question. Is it the first 02 sensor or the second 02 sensor. The first being by the header or the second one that is actually on the cat itself? Upstream or downstream on driver side?
05 dodge ram 1500 4.7
I put the spark plug fouler on the first one and im still getting the code. When i put it on the second one then i no longer got code but i got a new code p0133 running too slowly or something like that
Also which side is the mod dobe on ecm if harnes or o2 side
Hi i bought a Toyota celica, the last owner has done both sensors with the same trick as you. Should i remove the tricker on the sensors number two. ?
I deleted my catalytic converter on my stock 2003 honda s2000. keep getting p0133 bank 1o2 sensor mostly every day within 50 - 100 miles after I erase it.. And every now and then I get a p0420 on my bank 2 o2 sensor. I'm using ram air intake. When you have time. Can you please let me know if I can try to fix my problem with your resistor/compacitor method on this video or do I need a hondata version 4 ecu and tune?if yes please tell me what size on bank1 and what size on bank 2.i really would appreciate it
Without a cat you'll always throw p0420 and you'll need a full simulator (and not just modify the existing one)
As for the AF sensor that means there's an issue with your engines combustion, either a vacuum leak or busted injector.
Question.....to keep the car original, for whatever reason, even to go back to stock at some later date....instead of cutting wires..... can you buy a pair of male-female connectors....to capture the "mods" here you wish to make....with the resister and capacitor captured between the new connectors to make an "assembly"....and then plug this "assembly" to the original car's wiring harness connector on one end..... and ( on the other side of the "Assembly")....to the sensor plug?
Hi, on my Lexus 3.3 v6 it has a 3 oxygen sensors. Which one I have to solder this elements ? The last one (third) sensor I guess, right?
I had p0420 after doing this yesterday for 50miles, the engine light came back and it was p2a00. Do I really need to fix the 02 sensor from bank 1 sensor 1?
Use a spacer
@@speedkar99 I didn't get you
1M Ohm + 1uF is way too high for the modern ECUs. This is technically an open circuit, you get a new P0138 DTC, and fix 1,28V. I tried with 330K + 1uF too, didnt worked..
Somebody wrote the correct values, but his comment has been deleted! I dont know why.
4,6K + 100uF, works like charm since 5000 miles. Many thanks for your recommendation.
Thanks for your input, hope it helps those in the future looking to do this mod.
100uF isn't to high? or maybe you had in mind 1uF?
@@lukaszperski9370 No! 4,6K + 100uF 5V electrolyte. I use this setup since wrote the first comment. Works like a charm, no MIL.
Does using this fix negatively effect anything mileage/performance/reliability/longevity? I’m just saying, it’s tricking the vehicle to think everything is perfect when it really isn’t. I had MIL eliminators on my mustangs because they had no cats but they also had custom tunes installed instead of the factory programming. So with this fix you don’t need a custom tune? Thank you for your time. Great video as usual!
Eventually you'll need a new catalytic converter
@@speedkar99and what if you don't have a cat there
Does this work to clear the Catalyst Monitor? As of last year 2016-In California-were allowed one "not ready" monitor excluding the Catalyst Monitor.
+James Lancaster last I checked it was not ready, I didn't check after driving a few more thousand kms though. We are allowed one not ready here.
speedkar99 I have tried this on my 2004 Accord LX (a California vehicle) with SULEV & PZEV emissions. This only delayed the Catalyst Monitor. All monitors cleared except for the Catalyst. This stayed incomplete. After 3 drive cycles I received a CEL for Delayed 02 sensor function Bank 2. So this didn't work to clear the P420 code. In states where the Catalyst Monitor can remain incomplete this may work fine. Unfortunately in California completing this monitor is a requirement.
James Lancaster so this mod will cause the cat monitor to stay in the not ready state? Or you just need to drive till that monitor is complete?
What about the o2 heater circuit? If the car requires heat from the cat to reach the correct temp, wouldn't the monitor hang up on the heater? Then the o2 sensor test would never run, unless your car requires a lower temp to run the heater test. In the case where the monitor hangs up on the o2 heater, what would you do?
+Captain heater is a separate circuit
If thats broken you need a new sensor
I was referring to his mod specifically. I wasn't sure if the heaters would reach the correct temp without the cats installed. I'm guessing the heaters get hot enough for this mod to work on most vehicles, I was just throwing out the possibility of one not working without the additional heat from the cats. As for my issue (I still have cats, but this topic intrigues me anyway), I had a blown fuse that was causing all 4 o2 sensors to show a heater code, so the monitor wouldn't run.
Captain he never messed with the heated shit at all... heat makes the sensors work instantly and give accurate readings faster ya goob
You have a bad o2 sensor ( o2 sensor heater circuit is bad) change 02 sensor
The heater purpose is so the computer will go into closed loop fuel control faster. O2 sensors need to be at operating temp to generate a signal
Wiring the capacitor between those two wires also gives me about
20 Mohm of resistance between them, does that sound normal???
Maybe
@@speedkar99 well it's funny because I hooked up the multimeter leads to those two pins on the connector and saw the resistance rise second by second from about 6Mohm all the way up to 30Mohm and then zero at OFL lol.
Well now I'm getting the P0136 and P0137 because it's seeing low voltages.
Do you think a smaller resistor will pick the voltage up some???
it's an Electrolytic Capacitor before anyone comments..
the reason the signal is so smooth is the resistor limits the current for starters.
and the capacitor acts like a controlled power source only allowing a limited current each time,
by changing the capacitor you can alter the 'wave form'
basic electronics.
I agree it it basic, yet some of the writings i have seen make this complicated
This is a really usefull tutorial
You are my hero! Honda Civic Ej9 2000 fixed!
Good to know
Awesome video! It looks like in this case you would have passed the emissions test even without the fix, since the catalyst monitor still was not ready at the time of the test. I've eliminated a p0420 in a couple vehicles by putting a couple of spark plug non-foulers between the sensor and the exhaust as a spacer (it doesn't seem like it would work but it does). It's important to point out that any work-around like this is only a temporary fix; the catalytic converter should be replaced to avoid increased emissions, exhaust restriction and eventual performance issues
I agree. The only thing is cars here in Canada (mine included) are very rusty so adding the anti-foulers or replacing the catalytic converter is a bit more challenging.
Eventually when the cat fails pretty badly it will produce an O2 signal that the filter can't correct and throw a code.
Ah true, didn't even consider that fact. I'm spoiled since my cars are relatively rust-free (live in the Washington D.C. area). Is there an effective undercoating available, or is just a lost cause trying to fight the rust?
Its mostly a lost cause because of the amount of salt they use on the roads here in winter.
The most you can do is rust proof annually and keep washing the car after snowstorms.
It also depends on the vehicle manufacturer.
Joe Milton
yes, I'd like to know if the vehicle was able to pass the catalyst monitor or not, since resetting the code is separate from the addition of the RC filter. without seeing that monitor pass, it's inconclusive whether the ECU screening parameters were changed sufficiently to enable it to pass. a diode in line for a peak hold may be better if the catalyst is in worse condition than just marginal.
double posted
i have ford edge and i want to do this trick but i have grey and black wire which is positive and negative in my case???
Kurd Garage darker color is usually the negative
I don’t know if u still read this but just in case, I have a 2006 Toyota Highlander code 430 420 I did what u said with the com pastor and 1ohm r drove it 40 miles and the light came back on with the same code. What would u suggest I do?
Use an oxygen sensor scanner, graph outputs and see the difference. If you have the V6 you've got two banks to compare it against
Terrific Video... Thank you. Many things in it are way beyond my understanding, But i may muster up the nerve to try this!
Glad it helped
Hi, my check engine light on today . It say catalytic converter defect . But I have change it one month ago . Anyway I erase the code and check engine light gone . So my question is will it come back again. If so how long it will take to come back. Thanks
Golf 5 ( 2008 )
1.4 patrol engine
I drove with bad kat about a week but no engine light on and after I drove another week without Kat no engine light on . When I change my both Kat and drove 500km not engine light. Then I put fuel injector cleaner and drove another 150 km . And after engine light on and it says on my obd2 Kat defect.
is it ok if i use 1/8 watt 1M ohm resistor? or does it need a bigger watt resistor thanks in advance
It's trial and error. See what RC value works for you
great work i also have a solara. yours is so nice. mine is supercharged and it makes a big difference in acceleration
+jay7264 Sweet. Yea my solara can feel sluggish at times, you really have to give it throttle before it can pull.
Would this work for the 2002 Lexus IS 300? I have the PO430 code
Maybe. You need to play around with the capacitor values
Searching for 1 M ohm resistor now. Results comeback with more types:
1/4,1/2, 1 watt
Which one should I get or it doesn’t matter
I have a 2010 Prius with P0420 code as well. Thanks for your help
Does not matter which wattage you get. 1/4 Watt will work. There is very little current being passed through the resistor.
I did this on a 2006 vw jetta but did not work what do u suggest
You are a genius bro this is awesome
Thanks. Did it work for you?
My 2005 Honda Pilot has 3 oxygen sensors do I need to do this to all of them or will the codes tell me which ones need it?
Try the O2 sensor spacer
why do you think my 05 ody throws p0430 only after a gas fill up but if i only do a 3/4 gas fill up it is okay.
there may be a small leak in your exhaust system, take some soapy water and spray it over the exhaust while you have some pressure in the tail pipe(Use a vacuum on blow mode or a leaf blower). you can watch ChrisFixes latest video on how to do that. Who knows might fix the problem.
seal your gas cap with non dielectric grease
Did the catalyist monitor ever get ready?? Or does this keep it incomplete forever?
I don't recall
Does this work on Chrysler Town and country, I have a 2011 with p0420 bank 1 , I was thinking of trying a spacer and came across this video, any advice is appreciated
Does this work at all make and models
Not all
I have a 1 micro farad 50 volt capacitor I bought off of Amazon will it do the do or is it the wrong one
in video i saw 3volts ?
Can I just replace the o2 sensor?
No. If the sensor isn't faulty, it's detecting that the catalytic converter is faulty.
@@speedkar99 ok and thanks
Sure you have enough solder on the wires . Could perhaps I should add a bit more ?
2001 Camry V6 here. When buying the 1 meagohm capacitor, should i be looking for 1/2 watt or 1/4 watt?
1/4
Hey bro what did you do with the white wire please
Can this is done with pre cat oxygen sensor, ? My vehicle has only one pre cat coverter with 4 same color wires as your's !
No, that's known as an air/fuel sensor...it works with lambda values..
Because the Catalyst test was not complete, we don't know if this fixed the P0420 code and it could pop on in the middle of the smog test.
Most states can’t pass you if the Catylist is inc, any other category you are allowed one
I need help .. My car won't pass smog .. But no check engine light
Aww
What's the codes?
What is voltage range for capacitor?
Will it work on all Honda vehicles?
No
@@speedkar99 2016 will this work on honda brv
can it work for 2008 vw tourage?
Possibly
my 2000 civic has 2 white 1black and 1 gray.how conect?
+miro mekerishvili that uses a different oxygen sensor.
Your videos are fantastic man. Learning a ton off your videos. Keep up the good work! By the way what kind of scan tool is that?
I really need help getting my engine light turned off so it’ll pass smog
can you tell me how many volts the 1m resistor is and how many volts is the 1 Farad Capacitor is?
+Shawn Corsello the capacitor is probably 25V
As long as it handles a few volts of the oxygen sensor it shouldn't be a problem.
+Shawn Corsello resistors are measured in ohms
speedkar99 Electrolytic Decoupling Capacitors - 1000uF/25V will this work on a mazda RX8 2004 got the p0420
I thought the "catalyst" was the catalytic converter, the one you spoofed, so wouldn't that not be ready for emissions testing?
This.
With catalytic not ready... this fix is a failure
Mr ravetti, your a failure at being any kind of mechanic. Each system takes a certain amount of learn time to be considered ready from the ecu standpoint. There are things like short term and long term fuel trim, evap , ac, purge, oxygen heated air effic. And could go on.. some systems require a specific milage to be driven at exactly 30mph without decel below that speed which may take a while before a car can be driven the dustance set by mfg to do in order to ready that particular system for a self diagnosis which some systems will even say not ready or even not available. If you remove a certain component or it has a defect ive seen the system completely not recognize its installed and the system still work such as ac... if your car smokes when you drive, it doesnt always mean its burning oil. There could be a neighbors cat stuck on your tailpipe..
one not ready monitor is allowed; at least the MIL is off
yeahhh, it worked!!! i tried on my Civic 1.7 2004 and no more check engine light..
Jijie Ko haha... civic...
Does this save you from replacing the cat or sensor ?
I have a 2018 Malibu
I had code p0420 only so I switched sensors downstream to up and 3 codes came up on top. So I thought ok maybe it’s sensor
Now I put new sensor on top and stupid code came back p0420 so what can it be
Speed kar did you ever have any issues out of this mod ..im about ri try it on a 2006 lexus gs300
Not for a while. It was enough to pass the emissions we had at the time.
Curious- by doing this, will the mpg (fuel economy) and acceleration improve to normal levels? Currently with P0420, mpg and acceleration is really bad..
No it doesn't help with performance. It just tricks the computer
Hi, I have a single wire CAT O2 sensor (92 Honda), and the computer is sending 10.3Vdc to the sensor through this wir. Does this mean that the senor is just acting as a variable resistor (hence changing volts based on heat?). How can I use this DC supply of 10.3V from the computer to create a 0.4 to 0.7 V variable voltage using a RC circuit design in series? I was also looking at using ohms law to hold the voltage at a constant value of 0.5V by adding a resistor only if that works too.. Can you please help?
+Sajaad Nazim I'm not familiar enough with electronics to help, but you might want to research how a 1992 oxygen sensor works because that might be different than the newer cars
Hi, Thanks for replying. After some great research I found that this sensor on the CAT was not an O2 sensor but an Exhasut Temp. (EGT) sensor acting as a Thermistor with a negative temperature gradient. Was able to fix it by adding a 100K ohm resistor and grounding the single signal wire to the chasis. Now the computer assumes normal operating temp. and the light is gone too. Hope this helps to all who have Honda 92-95 JDM Eg hatch Models..
+Sajaad Nazim glad you found the issue
Looks like you have a short to power on the sensor signal wire
this circuit will slowly charge up the capacitor, taking approx. 244 minutes to load it up to 1v, giving again a bad reading. Any idea how could this be sorted out?
I got a simulation here
tinkercad . com/things/3j1cN3kpOsj (remove spaces before and after the .)
press Simulate, then Start Simulation
My mercedes sl350 after replacing o2 senso runing 50miles next day when i start the engine i get the check light with same bank 1 o2 sensor code anyone fix?
Play around with different RC values
bro you are a genius much love from Boston!!!
Is it works with 2007 honda accord !!!!
It Should, mine was 2004
Did the check engine come back on?
Not while I had the car
o2 sensor for 2006 Toyota Prius was cut off, how to fix?
where the catalog converter is
Does it have to be done on the harness for the vehicle or can it be put on the actual o2 wiring?
+Landry Barnett I put mine on the 02 wiring if I remember correctly. That way if you replace the sensor the car wiring is not damaged.
speedkar99 dang that is a long connector for that vehicle! ok that’s what I did but I must have made a mistake. I was wondering in case one of those wires is a shared connection like the EGR wiring for my 5.0 in my 01 mountaineer, in my case I need to put three resistors in basically a triangle to ensure proper outputs for the EGR that is gone and the other component that uses the shared connection. Thanks for your fast reply.
you could put it anywhere, but use solder because crimped connections will corrode.
Man ... you are on another level, I bet you're an engineer, my fancy college Control proff doesn't know shit about these wiring stuff :( brilliant job bro, with some good marketing descriptions at the beginning/ending of your videos you should have at least a million subscriber in less than 6 months, you're simply incomparable with these clowns youtubers out there
+moe raw thanks I'm glad you appreciate the effort I put into my videos. I'm a mechanical engineer with not much knowledge of electronics.
He's not an engineer, he's just not American that's why he's smart
Will this work for p0430 to ?
Is this mod better than the spacer? or the spacer with the mini catalytic converter?
will it work on something like a new BMW or Audi, ? bu new I mean like 2010 to 2015 somewhat recent.
Great video! Will this enable the catalyst monitor to go into complete/ready status?
Where do you buy those parts?Can I find those in any devices around the house like a broken Microwave or Old solid state devices?Is that more effective than the defouler that is all over Yutube?Is that legal to do in California?Thank you.
Rockauto
@@speedkar99 Will this work on 2009 Acura Tsx with po 420?But which converter there are two in TSX though.One in the exhaust Manifold and before the muffler.Thank you.$3,000 is the stealerships price on the one under the hood.
@@efrensaclolo7021 did it work for you?
plz.... Kindly ,,,, I have four different colors ,,,,, gray ,,,, black .... and two white
Does your method work for me?
Do you think it would work on Lexus 2004 ES330 P0420 code as well? If it is, should I do this of after Catalytic converter or before?
+EsDACcompany it would be after.
+EsDACcompany except you have a few cats on the ES
Thanks speedkar99. It is BANK 1 so I know which one to deal with. Just curious, does your brother know you take his used tooth brush to do cleaning? ;-) I am telling you, that portion on your other video clip was hilarious!!!
+EsDACcompany haha
Well he doesn't use his toothbrush so he probably doesn't know its missing to begin with.
Will this method work on a bmw 6 cylinder engine?
Let me know
No. It works for every car except urs. Sux to be u bro.
Has anyone tried this on a 2015-2017 Ford Mustang GT? If so, what values cleared the codes?
Your pass with ONE "not ready" monitor caught my attention. However, some bad news:
Ontario, Canada, Readiness Changes
As of October 3, 2016, readiness conditional passes will no longer be issued.
+TheAnalogKid2 thank you for letting me know. You made me dig into this further and I found out they're changing the law April 1 so you don't need emissions to register a car anymore too. More time to get this fixed!
Depending on year of vehicle, you dont need all monitors to be "ready"
Hopefully this all gets scrapped now anyways...
speedkar99 does this mod prevent the cat monitor from completing?
what tester did you use to test your oxygen sensor an see the graph moving
I don't remember the name. It was an advanced scanner that can graph obd out puts. Any laptop software should be able to graph now
I tried the same thing with a 2010 Lexus 250, need help it didn't work
What are the specs. for the capacitor and the resistor? uF and Wats. Great Video.
I used a 1M ohm resistor and 4.7 micro farad capacitor. Worked great on an E46 BMW