Great video. Just wanted to add a little trick I came up with. When replacing the front sensor, I tie a string to the sensor wire and dangle it down from above, through the engine compartment (be sure to leave enough slack, of course). This helps keep the wire from getting all twisted and flopping around. And when you're done tightening the sensor, the plug end of the wire is easily reachable from above, and you just plug it in. And as others have mentioned, RENT THE TOOL FOR THIS! You will be glad you did. Most parts stores lend them free.
Nothing insane about the wrench. I had an S10 pickup i had to use a pipe wrench and a long cheater bar to get it out of the exhaust. Using only a wrench means you are not in the rust belt
Thanks for the video. I was got a code saying that my catalytic converter was bad. After plenty of research and seeing how much a catalytic converter was, I decided to chance it and change both sensors on my 2013 Crosstrek. It’s been several months and I’ve had no issues.
Appreciate you showing an O2 sensor socket and installing to torque spec. The sensor housing isn't as robust as people might imagine. My 09 legacy H6 sits parked in the garage until I get both left bank sensors. I thought it was good preventative maintenance doing the rubber outlet/inlet for the 5eat at 100k. I had to drop a new radiator and thought it would be smart doing all 6 ATF hoses. Unfortunately, I don't have much for tools and ATF fluid soaked both sensors. I found out how external contamination works. It ran about 5 minutes until the whole left bank was misfiring and the engine shaking like it was death. Another good reason to not neglect the inner CV boots when they start to tear. H6 is double the fun. The charge port for the transmission sits right next to the cat also. Just a reminder to don't be sloppy or try to get by with an improper tool.
Great video, a little tip that worked better for me. In my 06 Forester, both sensors were very seized. I had to pull the fan and use a 22 mil wrench to break it free. The 02 sensor sockets did not allow me to get enough leverage. Thanks again Mr Subaru. A couple hundred saved again!
The code says oxygen sensor. The light comes on for a few days then I notice it goes off for a day sometimes two then it come back on. On and off. I have been letting it do this for quite sometime. The car runs perfectly, no bad engine idle. Good exceleration
By far the best video I’ve seen keep it up man. I just recently had a check engine light on my 98 Subaru Forester. It’s p0170. I cleaned the maf sensor and everyone is telling me it’s the up stream o2 sensor. Any tips my friend.
I hope you used the proper cleaning spray. The wrong one could damage the MAF. If it's the o2 sensor going bad be sure to replace it very, very soon before other damage is done. Not an expert but this is what everyone says and warns about.
Hello @MrSubaru1387, thank you for this and other very informative videos. As the owner of an aging subaru outback (2007), I have come to learn a lot from your content and expertise. As mentioned, I own a subaru outback 2007 H4. I have been experiencing intermittent check engine light on this car for about 3 months now, and the code is P2096. I say intermittent cause over this time, the check engine light has gone off on its own, and then came back on after a few days. One more thing to note is that it first came on a few days after I replaced the engine air filter for the first time since I put on 150k miles on this car - I know, it was long overdue. * I have since gone back in and checked that the box that houses the filter is sealed shut since that could have caused the fault, but i did not find any issue with that. * The next step for me is to replace the downstream oxygen sensor, but I hesitate to do that since I think if it was bad in the first place, the check engine light would not show the intermittent behavior, but will stay on. Even if i cleared the codes, it should come back on consistently in a reasonably short time of driving. But I am no expert, this is only my guess. What do you advise at this time? Any pointers will be very appreciated, thanks in advance!
You may be right.. Mine's at 358k but hasn't had a O2 sensor replaced since I bought it at 105K. Stopped running recently so it's time to replace them. So, it seems they lasted at least 250K if not the full 358K.
Your video is excellent in its image and the way you explained it. I want to thank you for it. If I may, I would suggest to use silicon dielectric grease inside the sockets, for protection against corrosion. Thanks, again.
Hi I have a P0420 code catalyst system efficiency below threshold bank 1 with my 2017 Subaru crosstrek with 31k miles. I don't know which one is the problem, the 02 sensor or the catalytic converter? I tried taking the negative from the battery and used obd2 sensor to clear the code, it cleared the check engine and cruise lights but the same problem would reoccur after driving for 30 minutes or so. May I please ask for your or anyone's assistance and suggestions what to do. Thank you very much
Thanks for the helpful video I have to replace both my O2 sensors because I suspect they're dirty after my head gaskets blew. I'm getting horrible gas mileage but no check engine codes. I think I should replace my rear cat too it is making noise. I am avoiding replacing the front if I can its just so much more expensive and looks complicated...
yikes. I'm quite worried about that as I buy parts and tools to change my already rusty 1993 Legacy sensors ( w/ 358K on them). I suppose I should try getting them off FIRST, ha ha.
This my first time replacing on my own. Anyways I'm getting ready to replace my O2 sensor I have two of them gotta replace. How would I know if it's enough 13.18ft. lbs ? Do I just enough turn to where it's snug? Like you turn with hand then the O2 tool couple of turns? What happens if the wires are twisted? How can I get the wires to hang enough to where there no problems. Sorry for all these questions.. have a great day thanks for the video. Hope to hear back from you soon..
Great video again. I replaced my O2 sensors on my Outback 2011, also the spark plugs, the PCV valve, I cleaned the throttle body, I reset the Iddle as per your video, and the Iddle is almost perfect but at least once a day a when going to a stop light, my car shakes very badly and turns off by itself, then I turn it on and works perfectly. I haven't clean the EGR because I'm unsure which one is it. Can you make a video on your brother's Outback on where to find it and clean it. I'd appreciate it. I think is one of the few thinks you haven't done. Thanks for all your teachings
Great Video. One Tip: Disconnect the sensor plugs FIRST, and you won't be severely twisting (and potentially stressing) the wire harness when you are removing the sensor.
I once had a Subaru legacy sedan and one year The check engine light is on but the car didn't have a plug for reader and I can't pass stupid smog check with the light on so I got a Hayes repair manual in it have a detailed instructions on how to check for the light it involves getting some wires out cutting few wires and connected them then to read how many times the light flashing it turned out of senser is bad, ordered one on line it's the same brand you got. Rent a sucket from parts store change it like you did and light went out after I started the car and I was happy took it for among check it passed without any problem 😉👍😅😍 but I like your channel because I have a Forester in my garage now, that old Subaru does have Head gasket problem I just check oil once a week otherwise I got a new set of tires and that is it
ok so I'm going to to confess that after a probably a year of putting it off I am must now getting around to trying to see why our Forester is throwing these codes. I've got the Check Engine light along with flashing cruise control and a steady traction control light on. I decided to go get the codes run at a local store again today (I hope their scanner was good) and today and same as before it showed P2096, P0113 and P0102. The MAF is fine, if it wasn't, then when you unplug it the car would simply keep running. Nevertheless I cleaned it with some MAF cleaner anyway. I also checked the air filter. It's fine. The fuel mileage has seemed ok. It's my daughter's car. She doesn't drive a lot, but we'd notice I think if it was really eating up the gas. I'm going to officiallly do a MPG check on it next fill up since I set the trip odometer on it last fill up. (Dad always buys the gas). I've had the shop look at it. They just ran the codes and were going to to charge me to do the work I can do, which is to replace the downstream sensor. The car is driving fine. There's no hesitation at all. I just don't think there's anything at all wrong, but then again, I'm not a mechanic so I'm asking for help here. If the downstream O2 sensor is bad, will you possibly not notice it? I don't know what else to troubleshoot before I replace it.
if this is an early Forester you wouldn't notice the downstream o2 sensor being bad at all. It exists for emissions purposes, basically so that it can throw a CEL if the cat goes bad
The automatic headlight sensor on top of the dashboard on the passenger side of my 2019 Outback is fogged. Can I replace this myself and do you know the part number? Thanks.
Thank you for your time brother! I wanted to ask you. I have myself an outback h4 04 and I don't know how to located bank2 02 sensor. Google doesn't help me lol. Thanks
If the check engine light is on and code 420 (catalytic converter) could changing the oxygen sensor fix the problem, or is 420 code the catalytic converter has to be replaced, or can it be fixed by other means? Some catalytic converter problems have been fixed by cleaning the valve cover.
No one ever shows disconnecting the electrical connections.......I'm convinced because this can't be done, I'm over three hours into trying to undo the connections over two weeks and have tapped out.....Can't be done on a Subaru Forester 2011 BOTH sensors with 4" leads locked in side by side with no wiggle room Brilliant Engineering
Thank you for this Video! Before you replaced it did you notice any engine stutter? My downstream O2 code is the only one being tripped but recently the engine has started stuttering a bit and I'm hoping a sensor swap will resolve that as well😅
If I change one sensor should I change both? Upstream and downstream at the same time? I was advised to just change the upstream. My 2012 forester throwing a code and dying on me.
I should have watched your video first... So I changed only one sensor ( B1s2 ) and soon thereafter my car started to throw another code, P1153. The car smelled like rotten eggs and the like. from what I've surmised, I've cooked my cat. I would like to replace it but am having doubts about one I've found on a particular site. can you help me out?
i have heard it mentioned elsewhere that a bad air fuel sensor is most likely what is causing random jerky acceleration in my 2008 outback. has anybody else hear heard similar or infact found this to be true based on personal first hand experience ?
I own a 2009 Subaru legacy 2.5i,I have the same problem in 4th gear at 4000rpm ill get this terrible jerking check engine light so could be time to change my sensors and your sensors lol
Hi I suspect I need to replace my oxygen sensors on my 2005 RS Impreza 2.5 L . I just watched another guy on UA-cam doing it on same model who removed the axel to get to the sensor , is this really necessary for this model?
Thanks for making this video it is super helpful being able to see what you are doing and which sensors you are swapping out. I'm currently in the process of replacing the O2 sensors on my 2005 Legacy 2.5i. I started by ordering just the upstream sensor because that is the one throwing the error code, but after getting under the car it looks like my sensors are currently installed wrong by the previous owner?? The connector ends match the opposite of what you have in your video. I just ordered the downstream sensor now too, and will just swap them out at the same time and hopefully I plug them into the correct connectors.
Will this throw a code in the OBD2 scanner? I’m having cylinder misfires after changing spark plugs and wires in my 01 forester. Exhaust has carbon and seems to be running rich. Anyone have any ideas?
+Evan Hartenburg an O2 sensor socket is heavily recommend. Using a normal open end combo wrench can round off the O2 sensor making it nearly impossible to remove. It all depends on how stuck it is, which they're normally in there pretty good due to the heat cycles. At the least I'd recommend a flare nut wrench if you don't have an O2 sensor socket.
I recently got a P2096 code on my 2010 Outback 2.5L. I checked the sensors with a multimeter and both tested good(2.8 ohms on upstream, 5.8 ohms on downstream). Not sure how to proceed from here. Any suggestions?
I got a P2096 Post Catalyst Fuel System Too Lean Bank 1 code today with check engine light on, skid light on, brake light and cruise flashing on a 2010 Legacy with 104000 miles. I am thinking of just replacing the o2 since most state that this is usually the problem. Big cost difference. Do you recommend a brand?
85% of the time, a lean code is caused by a lean condition, not a bad oxygen sensor. Most likely you have unmetered air being drawn in between the MAF sensor and the cylinder head. So, loose intake ducting, bad throttle body gasket, bad intake manifold gasket, leaking fuel injector o-ring, etc. Or, you have an exhaust leak between the cylinder head and the oxygen sensor. Leaking exhaust manifold gasket, etc. I recommend using only the OE oxygen sensor. Aftermarket sensor tend to give incorrect readings. I believe Denso is the OE on the 2010.
I have a 2012 Subaru Forester and I am pulling a P0171 error code, I have cleaned out the MAF once with CRC. Error code triggered again after 40 miles. I am told it could also be B1S1 Sensor, do youj think this would be a complicated replacement. Or should I further investigate the MAF solution. Car has 46k on it mileage and is in good repair, I seem to have experienced a loss in gas mileage, that immediately improved following the cleaning of the MAF. But the error codes returned as I said.
P0171, system too lean bank 1. You have an air leak between the MAF and the combustion chamber. A common failure is the intake manifold gasket. With the engine running, you can carefully spray brake cleaner or carb cleaner around the base of the intake manifold where it meets the cylinder head. If you have a leak, the engine RPM will audibly change. You could also have a low fuel pressure issue, but isn't as likely.
Good video Mr Subaru..I have a question. How long does it take to jack up and replace the upstream o2 sensor ? Because I'm taking my 01 subaru outback to a mechanic??
I have an 04 Outback 4 cylinder, that comes up with a p0057 code. AZ says it's a bank 2 sensor 2 issue. Where is that located? As always, great job and thanks.
@MrSubaru1387 great video, my Forester 2010 2.5 XT gas has P0037, which sensors do you recommend to purchase and replace? original Subaru? or is there at the market good ones not so expensive. thks
P0037, Heated oxygen sensor heater control circuit low (Bank 1 Sensor 2) This code is in reference to the rear sensor. You'll need to check the wiring harness and power out of the harness to the oxygen sensor heater. Usually a heater circuit is a burnt out heater inside the sensor, but sometimes it's an issue with the wiring or computer. If you just want to replace the sensor without testing anything, it is the post catalyst sensor.
Mr Subaru - 06 Outback 2.5 P0420. Assuming this is a bad Cat do you have any recommendations for aftermarket replacement? Would replacing Front O2 sensor help? Car has ~= 170K. Any opinion on Pacesetter 324094? Many thanks..
I've heard good things about the Walker and magna-flow cats, not sure with the pacesetter. I'd check response of the oxygen sensors before replacing anything.
you still active? I am having a wretched time trying to find a downstream sensor for sale on Amazon. I did find one seller that was selling a sensor that claimed being either "down or upstream". Is that right? These can work in either placement??? I have a 1993 Legacy 2.2L Also, their chart says it is for the "BEFORE cat converter". Does that mean upstream? why can't they just use the same terminology? I'll assume upstream means "before" and continue fruitless searching for a downstream "after" sensor that's not a universal kit. any info welcome.
Funny came across this video and I'm about to do this to my 13 3.6R got some denso units for 50 buck each I don't know the size of the o2 sensor socket I need she's got 85k on her.
Okay any help would be greatly appreciated... My 2000 Subaru Legacy GTB (JDM) is having an idling problem in neutral. It cannot maintain ~1000RPM in neutral. There are no performance issues but it will stall if left in neutral for long enough because the rpm gauge will drop and rise from 1000 until it eventually dies. Would this be from the O2 sensor? Thanks
@@MrSubaru1387 similar issue , 2000 GTB wagon jdm manual, when cold only on start up it has rough idle like it does to 500rpm then goes back up to 1000 but never stalls and is sweet when warm? Idel air control valve? Or o2 sensor? When I got it it had a leaking secondary turbo vf32 that I have since replaced. Any suggestions, I cleaned the iacv with throttle body cleaner.
Thank you for all your very helpful videos! Quick question regarding replacing O2 sensors - should you replace both sensors at the same time even if I'm only getting a code for Bank 1 Sensor 1? Thanks again!
The first oxygen sensor in the video was the upstream or pre-cat sensor. The second sensor was the downstream or post-cat sensor. Even though the sensor is screwed into the back end of the cat.
If you plan on doing the job, stay away from the oxygen sensor tools. Most sensors that i take out are always frozen. Using a crowfoot type socket/wrench will usually break the tool. i just did a 2006 Outback and used a 22mm deepwell socket with an 18" breaker bar. After I used all my strength, it gave and out it went. Doing it this way, you cut the wire to the sensor for socket accessablity. Also, dont bother using w-2 40 on it. It has a washer type shield that keeps your liquid from finding its target.
I replaced both the precatalytic Denso sensors and post sensor on my 2002 Subaru Outback h6 3.0l , and I keep getting a service engine light with code P0051 HO2S heater control circuit low Bank 2 Sensor 1. Is this the driver or passenger side, and why does it mean? It comes immediately on after I clear the codes.
Does anyone know if they need 2 o2 sensors I have a 03 Impreza bug eye and the guy I got it from straight piped it cats are on the way and I just want to have all the parts
that's exactly what's happening with my 02 outback 4 cyl. NO ROOM to operate any tool above the exhaust pipe. I think maybe i'll just remove the entire cat. converter and then will install the sensors. Haven't tried that yet..
Frorester01 to 05 i remove the front exhaust at the manifold and 2 spring loaded bolts, easy, also used denso pre cat $250aus, in tassie go to cool running in lst
I've replaced both sensors and error code is still there. Hi fuel consumption. I've checked, when i start the engine, heater works and the signal goes toward 1V on both. So the sensors work and their heaters. Where possibly look for?
@@xJeanplef Thanks. Is it sure? Is it expensive? Can I get a cheap from the scrap, to try and then if it works buy a new one? Perhaps you are right as replacing the post cat sensor, gave me impression that car has more power, and perhaps some better fuel economy. Can I replace cat myself? Is it easy?
@@johncommon4294 Try this before you do anything else : 1) Turn off the lights, aircon, stereo or any system in the car that draws extra current on top of the engine. 2) Disconnect the battery for 30 mins. 3) Reconnect the battery. 4) Before you start the car for the first time, turn the key to the ON position but do NOT turn the engine over. Wait 10-15 seconds so the electronic throttle body or IACV has time to go to the factory programmed home position. 5) After waiting, start the car and let it idle without any load, lights, A/C etc. 6) Every 20 seconds or so the idle will be adjusted up and down as the ECU tries to adjust it towards a stoichiometric fuel / air mix. 7) Leave the engine running for a full 10 mins but DO NOT TOUCH THE ACCELERATOR during this time or turn on anything that will cause extra electrical current draw. 8) Turn off the engine, and leave the key in the OFF position for at least 20 sec. 9) As per step (4) turn the key back to the ON position for 10-15 sec without actually starting the engine. 10) Start the engine and leave to idle for a further 5 minutes without touching the accelerator and without turning on other systems in the car. 11) Turn off the engine again and wait at least 20 sec before restarting. 12) Take the car for a test drive as the ECU should now be fully retrained.
@@xJeanplef Thanks, I will do it soon. I believe it may work. In the past I did reprogrammed the Camry key. ALso that sort of reprogramming. Thanks. I will do it and let you know.
@@xJeanplef I have done it all. The lamp is on and now it seems that the fuel consumption raises slowly. Perhaps it is catalythic converter. THanks for advise, and I am quite sure, Subaroo is my first and last one. I'd better return to Toyota. Thanks again.
They're Advan RGIIs. I bought them and had them shipped to me from Japan. They don't make this model anymore if I remember correctly. I think Advan has an RGIII or RGD now.
If both oxygen sensors are functioning correctly, then you have no need to replace them. Really only replace them due to slow response time, contamination, failure, etc.
Thank you for being so informative without any background music. Super helpful video.
Great video. Just wanted to add a little trick I came up with. When replacing the front sensor, I tie a string to the sensor wire and dangle it down from above, through the engine compartment (be sure to leave enough slack, of course). This helps keep the wire from getting all twisted and flopping around. And when you're done tightening the sensor, the plug end of the wire is easily reachable from above, and you just plug it in.
And as others have mentioned, RENT THE TOOL FOR THIS! You will be glad you did. Most parts stores lend them free.
Nothing insane about the wrench. I had an S10 pickup i had to use a pipe wrench and a long cheater bar to get it out of the exhaust. Using only a wrench means you are not in the rust belt
Thanks for the video. I was got a code saying that my catalytic converter was bad. After plenty of research and seeing how much a catalytic converter was, I decided to chance it and change both sensors on my 2013 Crosstrek. It’s been several months and I’ve had no issues.
Always put some small pieces 1/2 plywood or other wood under jack stands when working on a gravel or asphalt driveway. Thanks for the video.
Appreciate you showing an O2 sensor socket and installing to torque spec. The sensor housing isn't as robust as people might imagine. My 09 legacy H6 sits parked in the garage until I get both left bank sensors. I thought it was good preventative maintenance doing the rubber outlet/inlet for the 5eat at 100k. I had to drop a new radiator and thought it would be smart doing all 6 ATF hoses. Unfortunately, I don't have much for tools and ATF fluid soaked both sensors. I found out how external contamination works. It ran about 5 minutes until the whole left bank was misfiring and the engine shaking like it was death. Another good reason to not neglect the inner CV boots when they start to tear. H6 is double the fun. The charge port for the transmission sits right next to the cat also. Just a reminder to don't be sloppy or try to get by with an improper tool.
thanks bro,I Iike how you take the time to get back to people. good looking out.
+mannyman welcome sir. 👍
Great videography and high resolution quality. Thank you.
Great video, a little tip that worked better for me. In my 06 Forester, both sensors were very seized. I had to pull the fan and use a 22 mil wrench to break it free. The 02 sensor sockets did not allow me to get enough leverage. Thanks again Mr Subaru. A couple hundred saved again!
Thanks for the video- helped me fix my 2013 Outback. Turned out the O2 sensor was just loose!
The code says oxygen sensor. The light comes on for a few days then I notice it goes off for a day sometimes two then it come back on. On and off. I have been letting it do this for quite sometime. The car runs perfectly, no bad engine idle. Good exceleration
Thanks for your great details on your mechanical abilities on Subarus
Thank you so much for your incredible videos. That have helped me maintain my 2007 Impreza!
Very helpful and worked great on a 2013 outback downstream O2 sensor replacement, many thanks!
I'm pretty impressed you can set up a camera right where your workin, iv done a few engines and couldent imagine trying to film
By far the best video I’ve seen keep it up man. I just recently had a check engine light on my 98 Subaru Forester. It’s p0170. I cleaned the maf sensor and everyone is telling me it’s the up stream o2 sensor. Any tips my friend.
I hope you used the proper cleaning spray. The wrong one could damage the MAF. If it's the o2 sensor going bad be sure to replace it very, very soon before other damage is done. Not an expert but this is what everyone says and warns about.
Very nice video. Glad you did not add any annoying music. keep up the good work.
Hello @MrSubaru1387, thank you for this and other very informative videos. As the owner of an aging subaru outback (2007), I have come to learn a lot from your content and expertise.
As mentioned, I own a subaru outback 2007 H4. I have been experiencing intermittent check engine light on this car for about 3 months now, and the code is P2096. I say intermittent cause over this time, the check engine light has gone off on its own, and then came back on after a few days. One more thing to note is that it first came on a few days after I replaced the engine air filter for the first time since I put on 150k miles on this car - I know, it was long overdue.
* I have since gone back in and checked that the box that houses the filter is sealed shut since that could have caused the fault, but i did not find any issue with that.
* The next step for me is to replace the downstream oxygen sensor, but I hesitate to do that since I think if it was bad in the first place, the check engine light would not show the intermittent behavior, but will stay on. Even if i cleared the codes, it should come back on consistently in a reasonably short time of driving. But I am no expert, this is only my guess.
What do you advise at this time? Any pointers will be very appreciated, thanks in advance!
Thanks for the information! i was about to buy a brand new one! Glad to know they are a lifetime part!
You may be right.. Mine's at 358k but hasn't had a O2 sensor replaced since I bought it at 105K. Stopped running recently so it's time to replace them. So, it seems they lasted at least 250K if not the full 358K.
Your video is excellent in its image and the way you explained it. I want to thank you for it. If I may, I would suggest to use silicon dielectric grease inside the sockets, for protection against corrosion. Thanks, again.
Hi I have a P0420 code catalyst system efficiency below threshold bank 1 with my 2017 Subaru crosstrek with 31k miles. I don't know which one is the problem, the 02 sensor or the catalytic converter? I tried taking the negative from the battery and used obd2 sensor to clear the code, it cleared the check engine and cruise lights but the same problem would reoccur after driving for 30 minutes or so. May I please ask for your or anyone's assistance and suggestions what to do. Thank you very much
I have the same problem.Did you manage to sort out the issue?
Thanks for the helpful video I have to replace both my O2 sensors because I suspect they're dirty after my head gaskets blew. I'm getting horrible gas mileage but no check engine codes. I think I should replace my rear cat too it is making noise. I am avoiding replacing the front if I can its just so much more expensive and looks complicated...
You're welcome. 👍🏻
Just cut the rear cat out and weld in straight pipe, it's cheaper and it won't throw any codes because there are no o2 sensors on the rear cat
Incorrect. Will have a P0420.
And illegal.
@@MrSubaru1387 depends what state you live in.
Great video, just can't get my upstream sensor off. I used the exact same setup and Pb blaster. Nothing. Hopefully one day. 😆
yikes. I'm quite worried about that as I buy parts and tools to change my already rusty 1993 Legacy sensors ( w/ 358K on them). I suppose I should try getting them off FIRST, ha ha.
What size ratchet are you using trying to tackle this weekend I have the o2 sensor sockets but not the ratchet
flex head Snap on iirc FL70 ? 3/8 drive 14-15"oal
This my first time replacing on my own. Anyways I'm getting ready to replace my O2 sensor I have two of them gotta replace. How would I know if it's enough 13.18ft. lbs ? Do I just enough turn to where it's snug? Like you turn with hand then the O2 tool couple of turns? What happens if the wires are twisted? How can I get the wires to hang enough to where there no problems. Sorry for all these questions.. have a great day thanks for the video. Hope to hear back from you soon..
Great video again. I replaced my O2 sensors on my Outback 2011, also the spark plugs, the PCV valve, I cleaned the throttle body, I reset the Iddle as per your video, and the Iddle is almost perfect but at least once a day a when going to a stop light, my car shakes very badly and turns off by itself, then I turn it on and works perfectly. I haven't clean the EGR because I'm unsure which one is it. Can you make a video on your brother's Outback on where to find it and clean it. I'd appreciate it. I think is one of the few thinks you haven't done. Thanks for all your teachings
Do you need to clear the code? If so do you do it before you start the vehicle after installing a new o2 sensor?
Was that a crows feet o2 sensor socket?
YES
Great Video. One Tip: Disconnect the sensor plugs FIRST, and you won't be severely twisting (and potentially stressing) the wire harness when you are removing the sensor.
I once had a Subaru legacy sedan and one year The check engine light is on but the car didn't have a plug for reader and I can't pass stupid smog check with the light on so I got a Hayes repair manual in it have a detailed instructions on how to check for the light it involves getting some wires out cutting few wires and connected them then to read how many times the light flashing it turned out of senser is bad, ordered one on line it's the same brand you got. Rent a sucket from parts store change it like you did and light went out after I started the car and I was happy took it for among check it passed without any problem 😉👍😅😍 but I like your channel because I have a Forester in my garage now, that old Subaru does have Head gasket problem I just check oil once a week otherwise I got a new set of tires and that is it
I noticed that you did not coat the threads of the new OS with anti-seize compound. Some others say you should. Opinion?
small amount on threads from mfg , look closely at unboxing
ok so I'm going to to confess that after a probably a year of putting it off I am must now getting around to trying to see why our Forester is throwing these codes. I've got the Check Engine light along with flashing cruise control and a steady traction control light on. I decided to go get the codes run at a local store again today (I hope their scanner was good) and today and same as before it showed P2096, P0113 and P0102. The MAF is fine, if it wasn't, then when you unplug it the car would simply keep running. Nevertheless I cleaned it with some MAF cleaner anyway. I also checked the air filter. It's fine. The fuel mileage has seemed ok. It's my daughter's car. She doesn't drive a lot, but we'd notice I think if it was really eating up the gas. I'm going to officiallly do a MPG check on it next fill up since I set the trip odometer on it last fill up. (Dad always buys the gas). I've had the shop look at it. They just ran the codes and were going to to charge me to do the work I can do, which is to replace the downstream sensor.
The car is driving fine. There's no hesitation at all. I just don't think there's anything at all wrong, but then again, I'm not a mechanic so I'm asking for help here. If the downstream O2 sensor is bad, will you possibly not notice it? I don't know what else to troubleshoot before I replace it.
if this is an early Forester you wouldn't notice the downstream o2 sensor being bad at all. It exists for emissions purposes, basically so that it can throw a CEL if the cat goes bad
The automatic headlight sensor on top of the dashboard on the passenger side of my 2019 Outback is fogged. Can I replace this myself and do you know the part number? Thanks.
Are Bosch O2 sensors the exact replacement from factory on a 2013 Subaru Legacy? Some people were mentioning Denso
Should be Denso.
Thank you 🙏🏼
Thank you for your time brother! I wanted to ask you. I have myself an outback h4 04 and I don't know how to located bank2 02 sensor. Google doesn't help me lol. Thanks
If the check engine light is on and code 420 (catalytic converter) could changing the oxygen sensor fix the problem, or is 420 code the catalytic converter has to be replaced, or can it be fixed by other means? Some catalytic converter problems have been fixed by cleaning the valve cover.
that code means you have weed in your engine
I have I have a Subaru with 02 sensors do I need to change them all or just the last one?
No one ever shows disconnecting the electrical connections.......I'm convinced because this can't be done, I'm over three hours into trying to undo the connections over two weeks and have tapped out.....Can't be done on a Subaru Forester 2011 BOTH sensors with 4" leads locked in side by side with no wiggle room Brilliant Engineering
Thank you for this Video! Before you replaced it did you notice any engine stutter? My downstream O2 code is the only one being tripped but recently the engine has started stuttering a bit and I'm hoping a sensor swap will resolve that as well😅
Did you get it figured out?? Mines doing the same 😔
Hey Mr. Just got a check engine light code P0420 is there a definitive way of finding out whether or not it's a O2 sensor or catalytic converter?
Yes, there are several methods to test.
@@MrSubaru1387 oh ok ...so any mechanic worth his salt will know what to do huh?
Should is the key word. Haha
If I change one sensor should I change both? Upstream and downstream at the same time? I was advised to just change the upstream. My 2012 forester throwing a code and dying on me.
Great video. I have a 04 Forester. I get about 200 miles to a full tank. I'm not a mechanic but any means. Will you consider this fix noob friendly?
Very much so. I'd check air and fuel filters as well.
I should have watched your video first...
So I changed only one sensor ( B1s2 ) and soon thereafter my car started to throw another code, P1153. The car smelled like rotten eggs and the like. from what I've surmised, I've cooked my cat. I would like to replace it but am having doubts about one I've found on a particular site. can you help me out?
i have heard it mentioned elsewhere that a bad air fuel sensor is most
likely what is causing random jerky acceleration in my 2008 outback. has
anybody else hear heard similar or infact found this to be true based
on personal first hand experience ?
I own a 2009 Subaru legacy 2.5i,I have the same problem in 4th gear at 4000rpm ill get this terrible jerking check engine light so could be time to change my sensors and your sensors lol
My mechanic said I should only replace with the Denso sensor. Any thoughts?
Hi On a 2013 outback prem. do you still think Bosh is ok to use?
Good Job! / Lan ona eta handia! 👍
Hi I suspect I need to replace my oxygen sensors on my 2005 RS Impreza 2.5 L . I just watched another guy on UA-cam doing it on same model who removed the axel to get to the sensor , is this really necessary for this model?
Thanks for making this video it is super helpful being able to see what you are doing and which sensors you are swapping out. I'm currently in the process of replacing the O2 sensors on my 2005 Legacy 2.5i. I started by ordering just the upstream sensor because that is the one throwing the error code, but after getting under the car it looks like my sensors are currently installed wrong by the previous owner?? The connector ends match the opposite of what you have in your video. I just ordered the downstream sensor now too, and will just swap them out at the same time and hopefully I plug them into the correct connectors.
Will this throw a code in the OBD2 scanner? I’m having cylinder misfires after changing spark plugs and wires in my 01 forester. Exhaust has carbon and seems to be running rich. Anyone have any ideas?
Is it imperative to use a o2 sensor socket or will a regular 7/8 or whatever wrench do fine?
+Evan Hartenburg an O2 sensor socket is heavily recommend. Using a normal open end combo wrench can round off the O2 sensor making it nearly impossible to remove. It all depends on how stuck it is, which they're normally in there pretty good due to the heat cycles. At the least I'd recommend a flare nut wrench if you don't have an O2 sensor socket.
Hey do you know if it would be the same sensors for a ej257 on a 2008 sti?
I recently got a P2096 code on my 2010 Outback 2.5L. I checked the sensors with a multimeter and both tested good(2.8 ohms on upstream, 5.8 ohms on downstream). Not sure how to proceed from here. Any suggestions?
I got a P2096 Post Catalyst Fuel System Too Lean Bank 1 code today with check engine light on, skid light on, brake light and cruise flashing on a 2010 Legacy with 104000 miles. I am thinking of just replacing the o2 since most state that this is usually the problem. Big cost difference. Do you recommend a brand?
85% of the time, a lean code is caused by a lean condition, not a bad oxygen sensor. Most likely you have unmetered air being drawn in between the MAF sensor and the cylinder head. So, loose intake ducting, bad throttle body gasket, bad intake manifold gasket, leaking fuel injector o-ring, etc. Or, you have an exhaust leak between the cylinder head and the oxygen sensor. Leaking exhaust manifold gasket, etc. I recommend using only the OE oxygen sensor. Aftermarket sensor tend to give incorrect readings. I believe Denso is the OE on the 2010.
Do we need to Reset the ECU after install it or it doesn’t matter?
You shouldn't. It will correct with time.
hey thanks for the video as the code for this just popped up on my forester
Do I need to put anti seize when I install new sensors?
a little dab will do !
do you know what size of oxygen sensor socket I need for my Impreza 2015?
I see that Bosch brand sensors came out of the car -- but I thought that Denso was the OEM brand (at least in America)?
I have a 2012 Subaru Forester and I am pulling a P0171 error code, I have cleaned out the MAF once with CRC. Error code triggered again after 40 miles. I am told it could also be B1S1 Sensor, do youj think this would be a complicated replacement. Or should I further investigate the MAF solution. Car has 46k on it mileage and is in good repair, I seem to have experienced a loss in gas mileage, that immediately improved following the cleaning of the MAF. But the error codes returned as I said.
P0171, system too lean bank 1. You have an air leak between the MAF and the combustion chamber. A common failure is the intake manifold gasket. With the engine running, you can carefully spray brake cleaner or carb cleaner around the base of the intake manifold where it meets the cylinder head. If you have a leak, the engine RPM will audibly change. You could also have a low fuel pressure issue, but isn't as likely.
Good video Mr Subaru..I have a question. How long does it take to jack up and replace the upstream o2 sensor ? Because I'm taking my 01 subaru outback to a mechanic??
Maybe 30 mins total.
I currently have a 07 Impreza 2.5i runs good but has P0420. Bank 1 sensor 1 voltage from 2.5 to 3.2 volts O2 sensor bad ????
I have an 04 Outback 4 cylinder, that comes up with a p0057 code. AZ says it's a bank 2 sensor 2 issue. Where is that located? As always, great job and thanks.
In or behind the catalytic converter.
@@MrSubaru1387 it didn't specify if it was in front or behind the cat.
Sensor 1 pre-cat. Sensor 2 post-cat. Bank 1 is the bank with cylinder one. Bank 2 is the opposing bank of cylinders.
@@MrSubaru1387 So bank 2 sensor 2 is located on the drivers post cat?
Bank 1 & 2 run together before the cat. Just one pipe out of cat. That's sensor 2 or the downstream.
Hi. What year is this Subaru? I need to change the upstream sensor on my 1999 impreza outback sport. Will it be similar?
1998 Legacy GT. Your impreza should be nearly identical.
@MrSubaru1387 great video, my Forester 2010 2.5 XT gas has P0037, which sensors do you recommend to purchase and replace? original Subaru? or is there at the market good ones not so expensive. thks
P0037, Heated oxygen sensor heater control circuit low (Bank 1 Sensor 2) This code is in reference to the rear sensor. You'll need to check the wiring harness and power out of the harness to the oxygen sensor heater. Usually a heater circuit is a burnt out heater inside the sensor, but sometimes it's an issue with the wiring or computer. If you just want to replace the sensor without testing anything, it is the post catalyst sensor.
Mr Subaru - 06 Outback 2.5 P0420. Assuming this is a bad Cat do you have any recommendations for aftermarket replacement? Would replacing Front O2 sensor help? Car has ~= 170K. Any opinion on Pacesetter 324094? Many thanks..
I've heard good things about the Walker and magna-flow cats, not sure with the pacesetter. I'd check response of the oxygen sensors before replacing anything.
@@MrSubaru1387 Thanks for the reply. I'll check the 02 response this weekend. MagnaFlow does not make one for 06 MY
Thank you
You're welcome. 👍
Very helpful. Thanks
Would p0030 be for the front or catalytic sensor?
Just had both head gaskets and timing belt replaced, curious what does replacing both o2 sensors accomplish?
+Marvin Wilkins a leaking head gasket can contaminate the oxygen sensors. That results in poor fuel economy and poor drivability.
@MrSubaru1387 Ok cool thanks for the info my 01 Outback is back to normal after replacing the upstream o2 your vids are on point thanks
+Marvin Wilkins glad to help
Hi, I got a code P2433 Air System Air flow/ Pressure Sensor circuit High Bank 1.
Will this be the right video to fix it??
you still active? I am having a wretched time trying to find a downstream sensor for sale on Amazon. I did find one seller that was selling a sensor that claimed being either "down or upstream". Is that right? These can work in either placement??? I have a 1993 Legacy 2.2L Also, their chart says it is for the "BEFORE cat converter". Does that mean upstream? why can't they just use the same terminology? I'll assume upstream means "before" and continue fruitless searching for a downstream "after" sensor that's not a universal kit. any info welcome.
Funny came across this video and I'm about to do this to my 13 3.6R got some denso units for 50 buck each I don't know the size of the o2 sensor socket I need she's got 85k on her.
How did it go? I’ve got a ‘14 3.6 I’m probably due to change mine soon and I’m thinking about getting the denso ones.
Okay any help would be greatly appreciated...
My 2000 Subaru Legacy GTB (JDM) is having an idling problem in neutral. It cannot maintain ~1000RPM in neutral. There are no performance issues but it will stall if left in neutral for long enough because the rpm gauge will drop and rise from 1000 until it eventually dies. Would this be from the O2 sensor? Thanks
Automatic or manual transmission?
@@MrSubaru1387 similar issue , 2000 GTB wagon jdm manual, when cold only on start up it has rough idle like it does to 500rpm then goes back up to 1000 but never stalls and is sweet when warm? Idel air control valve? Or o2 sensor? When I got it it had a leaking secondary turbo vf32 that I have since replaced. Any suggestions, I cleaned the iacv with throttle body cleaner.
When you replace bank one sensor do you have to replace the lower sensor as well? The scanner only showed the top sensor jw
You don't have to, but it's recommended.
@@MrSubaru1387 I have to a 2013 Impreza 2.0 is this method the same for me
What 02 sensor do I need for the one behind the passenger front wheel for a ej205 on my 02 wrx?
Thank you for all your very helpful videos! Quick question regarding replacing O2 sensors - should you replace both sensors at the same time even if I'm only getting a code for Bank 1 Sensor 1? Thanks again!
It would be optimal to replace them both together to keep them at the same rate of reading/contamination level.
MrSubaru1387 Makes sense, thank you!
Do you have a part number for that sensor socket?
When you changed the 2nd 02 sensor would that one be considered before catalytic coverter
The first oxygen sensor in the video was the upstream or pre-cat sensor. The second sensor was the downstream or post-cat sensor. Even though the sensor is screwed into the back end of the cat.
If you plan on doing the job, stay away from the oxygen sensor tools. Most sensors that i take out are always frozen. Using a crowfoot type socket/wrench will usually break the tool. i just did a 2006 Outback and used a 22mm deepwell socket with an 18" breaker bar. After I used all my strength, it gave and out it went. Doing it this way, you cut the wire to the sensor for socket accessablity. Also, dont bother using w-2 40 on it. It has a washer type shield that keeps your liquid from finding its target.
Love those wheels!
+PigBoat9 thanks!
I replaced both the precatalytic Denso sensors and post sensor on my 2002 Subaru Outback h6 3.0l , and I keep getting a service engine light with code P0051 HO2S heater control circuit low Bank 2 Sensor 1. Is this the driver or passenger side, and why does it mean? It comes immediately on after I clear the codes.
I have the same code did you ever figure out what was pulling the code ?
Could anyone link me to a 2015 Subaru WRX Premium O2 sensor replacement video?
How long should we drive before the code disappears? I have a code reader but it says permanent P0 171
a well done video, nice work.
Are both the sensors the same part number?
NO
I wish I had seen this earlier, the Dealer charged close to a 1000$ for this...
Brutal
What they don't make in selling cars they make up in labor lol...
There's no way it should have cost that much
Damn they got ur ass 😴
Do you ever replace these just due to high miles? Have two 97' inch Imprezas, one with 200k other 170k. Both run fine
+Robert Ferraro yes. There is a maintenance interval for the oxygen sensors. Recommended to be replaced every 100k miles.
I have an ej201 but with on sensor only!(behind cat)
Is it normal?
Nice vid. Do you know how many o2 sensors an 01 legacy has?
Two on a 2.5L. Three on a 3.0L.
MrSubaru1387 thank you sir.
MrSubaru1387 can you tell me what sensors to go with?
@@MrDoomzy you're welcome. 👍🏻
@@MrDoomzy OE. Aftermarket sensors usually aren't calibrated the same. I believe the OE sensors are Bosch or Denso.
Appreciate the video! Do you recommend Bosch? Or any brand will do?
I recommend using Oem oxygen sensors. No universal fit sensors.
I changed the fuel filter and a day later I threw misfire codes on 3 and 4 it my not be realated. but what should i check 01 OB 2.5 thanks in advance
Check the coil for spark on 3&4. Check the plugs for 3&4 as well.
Does anyone know if they need 2 o2 sensors I have a 03 Impreza bug eye and the guy I got it from straight piped it cats are on the way and I just want to have all the parts
Do you have tips for removing the upstream sensor on a 03 legacy 2.5? I'm having a hard time getting a socket or a wrench in there ?
that's exactly what's happening with my 02 outback 4 cyl.
NO ROOM to operate any tool above the exhaust pipe. I think maybe i'll just remove the entire cat. converter and then will install the sensors. Haven't tried that yet..
Frorester01 to 05 i remove the front exhaust at the manifold and 2 spring loaded bolts, easy, also used denso pre cat $250aus, in tassie go to cool running in lst
@Mrsubaru1387 is this code the same as p3100 and p3000 if so I can finally fix my Outback
Hey where do you place your jack to lift a subaru both at same time (front n back
+mannyman front, jack on the cross member, flat spot right behind the oil pan. Rear, center differential.
What if you have no rear centre diff like the lx wagon ? Where do you put the jack then ?
+dtec30 a FWD model?
Yes fwd I have a gap where the diff would normally go
+dtec30 you'll need to jack up each side independently then.
thank you too 😀😀
+thesniperofcs 👍😆
Awesome video very helpful . Thank you 😊
You're welcome. 👍🏻
I've replaced both sensors and error code is still there. Hi fuel
consumption. I've checked, when i start the engine, heater works and the
signal goes toward 1V on both. So the sensors work and their heaters.
Where possibly look for?
Bad catalytic converter
@@xJeanplef Thanks. Is it sure? Is it expensive? Can I get a cheap from the scrap, to try and then if it works buy a new one?
Perhaps you are right as replacing the post cat sensor, gave me impression that car has more power, and perhaps some better fuel economy. Can I replace cat myself? Is it easy?
@@johncommon4294 Try this before you do anything else :
1) Turn off the lights, aircon, stereo or any system in the car that draws extra current on top of the engine.
2) Disconnect the battery for 30 mins.
3) Reconnect the battery.
4) Before you start the car for the first time, turn the key to the ON position but do NOT turn the engine over. Wait 10-15 seconds so the electronic throttle body or IACV has time to go to the factory programmed home position.
5) After waiting, start the car and let it idle without any load, lights, A/C etc.
6) Every 20 seconds or so the idle will be adjusted up and down as the ECU tries to adjust it towards a stoichiometric fuel / air mix.
7) Leave the engine running for a full 10 mins but DO NOT TOUCH THE ACCELERATOR during this time or turn on anything that will cause extra electrical current draw.
8) Turn off the engine, and leave the key in the OFF position for at least 20 sec.
9) As per step (4) turn the key back to the ON position for 10-15 sec without actually starting the engine.
10) Start the engine and leave to idle for a further 5 minutes without touching the accelerator and without turning on other systems in the car.
11) Turn off the engine again and wait at least 20 sec before restarting.
12) Take the car for a test drive as the ECU should now be fully retrained.
@@xJeanplef Thanks, I will do it soon. I believe it may work. In the past I did reprogrammed the Camry key. ALso that sort of reprogramming. Thanks. I will do it and let you know.
@@xJeanplef I have done it all. The lamp is on and now it seems that the fuel consumption raises slowly. Perhaps it is catalythic converter. THanks for advise, and I am quite sure, Subaroo is my first and last one. I'd better return to Toyota. Thanks again.
I like those wheels you have on there a lot, any way you can send a link to where i can get a set?
They're Advan RGIIs. I bought them and had them shipped to me from Japan. They don't make this model anymore if I remember correctly. I think Advan has an RGIII or RGD now.
Well poo, do you know of a company that makes something similar?
Advan is still in business. The RGIII and RG-D are similar to the RGII. Just Google Advan RGII and see what pops up for shopping.
Will do thanks
You're welcome.
Great job.
What improvement to mileage should one expect when both sensors are running fine?
If both oxygen sensors are functioning correctly, then you have no need to replace them. Really only replace them due to slow response time, contamination, failure, etc.
MrSubaru1387 mine is definitely broken, just curious what drawback it has on mileage. Thanks
A lot. Replace it asap.
Thanks, that's what I needed to hear.