O2 Sensor Replacement
Вставка
- Опубліковано 16 чер 2018
- Did our video help you? If so, consider buying us a beer: bit.ly/3feE6tJ
**PLEASE READ THIS AND THE COMMENT WE PINNED FOR HELPFUL INFORMATION **
In this video, we show you how to replace the upstream and downstream O2 Sensors on your 3rd Gen 4runner. This procedure would be the same for 1st Gen Tacomas and 1st Gen Tundras. This video will also give you an idea of how to accomplish this on other make and model vehicles as well.
The goal of this job was to improve the gas mileage of the vehicle and not to address a check engine code that popped up.
**For 3rd Gen 4runner years 96-98, the upstream and downstream sensors are both O2 sensors. Staring in 99, vehicles meeting the California spec had an Upstream Air/Fuel Sensor, and a Downstream O2 Sensor. So, for people with 99-02 3rd Gens, lift up your hood and look at the sticker affixed on the underside of your hood. You'll see the emissions sticker and you'll be able to find out whether or not your vehicle was built to California regulations so you'll know the right sensors to purchase. It's not just for vehicles that were purchased in California. Other states sold vehicles built to the California regulations as well so you have to look on the underside of the hood to know. If you replaced your hood and you don't know if your vehicle was built to California regulations, maybe a dealership could run your VIN number and tell you if it is or not.
*Denso Find My Part*
densoautoparts.com/find-my-par...
*Parts for my 1998 Toyota 4runner, Auto Trans, 4WD*
*Downstream O2 Sensor - Denso #234-4154
amzn.to/34eGt49
*Upstream O2 Sensor - Denso #234-4162
amzn.to/2Pimxcb
*HELPFUL TOOLS*
If you're looking for other tools not used in this video, check out Timmy's Master Tool List.
www.amazon.com/shop/timmythet...
*Kroil Penetrant - (used to pre-treat O2 sensor nuts so they'll come off easier)
amzn.to/35SuHxr
*1/4" and 3/8" Flex Head Ratchet Set - (used both these ratchets for this job. I used the 3/8" ratchet for the O2 sensor nuts and for the air box bolts. I used the 1/4" ratchet to loosen the air tube clamp and to remove the mass air flow sensor off the air box. These are super functional ratchets that will make your wrenching life easier.) amzn.to/2ql8nNA
*Stubby 3/8” Flex Head Ratchet - (it use to be available for sale separately but now we can only find it as part of this 4-piece set) amzn.to/39kQVit
*3/8" Drive 6 Point Metric Standard Socket Set
amzn.to/32WIh0M
*3/8" Drive 6 Point Metric Deep Socket Set
amzn.to/37iQjVt
*3/8” Drive Regular Extension Set
amzn.to/2OehCao
*1/4” Drive 6 Point Standard Metric Socket Set
amzn.to/2QIU7te
*1/4” Drive Regular Extension Set
amzn.to/2O9nl2x
*Dremel Tool Kit - (used in combination with the wires wheels to clean off gasket material off the exhaust) amzn.to/2DcQHqG
*Dremel Tool Wire Brush
amzn.to/2DVl59X
*Dremel Tool Wire Wheel
amzn.to/2G9Z21C
*Emery Cloth Roll - (used to help clean off gasket material off the exhaust)
amzn.to/38axDYh
*Super Fine Steel Wool - (used to finish the cleaning of the exhaust connection for the O2 sensor)
amzn.to/2YNckYh
*CDI 3/8" Drive 10-100 Foot Pound Torque Wrench
- (used to torque O2 sensor nuts)
amzn.to/2U2vUA4
*Inspection Mirror with LED Lights - (used to allow me to see how clean the exhaust surface was)
amzn.to/35bAmOU
*Milwaukee Mi12 Cordless Ratchet - (used to quickly remove the air box bolts)
amzn.to/2utRZsE
*Milwaukee M12 Battery
amzn.to/3FJZO1j
*Milwaukee M12 High Capacity Battery
amzn.to/2HEFTpu
*Milwaukee M12 Battery Charger
amzn.to/2uo2o9x
*Medium Size Magnetic Parts/Tool Tray (Good Size for keeping track of fasteners/small parts) amzn.to/2ky8Qt8
*Mass Air Flow Sensor Cleaner
amzn.to/36C0fbn
**As Ebay Partner Network members, we earn commissions from qualifying purchases.
**As Amazon Associates we earn from qualifying purchases. - Авто та транспорт
*PLEASE READ THIS COMMENT AND THE VIDEO DESCRIPTION FOR HELPFUL INFORMATION*
After doing more research and asking questions on a Toyota forum, it seems the consensus is the downstream O2 sensor is just for monitoring the catalytic converter function and has nothing to do with regulating the Air/Fuel mixture. I'm still not 100% convinced this is the case and I'm fine with the fact I might have wasted money replacing the downstream O2 sensor.
I have gone through a couple tanks of fuel since doing this job and it does appear I have improved my gas mileage. But, since it's hard to duplicate the exact driving conditions before the job, I can't say for sure how much it improved. Before the job, the best mpg I saw was 15.4 and that was mostly highway driving with some city driving. After the job, I went through a tank of fuel with similar driving, mostly highway with some city and I got 16.7 mpg. When I did 100% highway, I recorded 19 mpg.
So long term, did it improve mpg?
My 99 gets about 14 mpg highway, I love it but hate driving it for that reason.
time to get an ecoboost f150 2.7L , lol @@riverahector559
I got about the same increase after replacing the sensors on my 1997 4Runner. The increase was just under 1mpg. Now I get consistently over 18mpg. This has been repeated now after several refills. This is with a combination of highway and city driving. Not a huge increase but any increase is good. I haven’t tried 100% highway driving yet. I used to get 21.5 mpg on the highway when it was new. If I can reach 22mpg on the highway it would be great. I have 397k miles on the car.
At 20 years / 170k miles I'm looking at doing this for my 2000 4Runner. Come to find out that after 99 you also need to look and see if your vehicle is Calif or Federal EPA emissions. The Calif emissions vehicles have AFR (air fuel ratio) sensor for the upstream and basic O2 sensor downstream. Federal EPA (non Calif) vehicles use the same O2 sensor for both the upstream and downstream sensors. Additionally manual transmissions and 4wd/2wd all use different sensors.
Thomas Coolidge should ca 4runner’s change the front afr or o2 sensor first when you get the dreaded CEL?
My 2001 3.4 V6 Tacoma had a CEL for P0420 recently. I changed the upstream 02 Sensor. Denso of course. After the change I drove about 20-30 miles and light went off. I am the original owner and in my experience the P0420 is always the 02 sensor. Thanks Tim.
You're very welcome. Glad you fixed your issue.
Doesn’t the P0420 code mean it’s a defective catalytic converter (front)? So it can also mean the upstream 02 sensor as well?
My engine had no codes but when I replaced both o2 sensors, I’m getting way better mpg and now the engine feels like factory smooth. The truck has never felt this smooth. Not ever. It feels amazing. So happy, it’s like a brand new truck.
That's great you got a good result after swapping out your sensors. Good job!
what year is your rig? 5VZFE engine with a manual transmission?
@jvogler_art4708
Just finished replacing my upstream o2 with a new denso. No major rust issues but the previous owner rounded both nuts off. Had to use alternate rounds of pb blaster and propane torch to eventually get them off with some vice grip pliers. I was hoping for immediately better mpg but time will tell.
Well James, you won the war and that's what counts. Hopefully you'll find an improvement in mpg.
Hey Timmy I bought your scanning tool/device and worked perfectly with an app car scanner. Almost imidetelly I notice contants 0V reading on my o2 sensor 1 (before cat). Made some basic checks and cosinder it's broken. replaced both sensor (just in case) removed error codes P0171 and P0125 and guess what! No more check engine light. Huge improvement on engine general work. No more missfire, no more high rpm at idle and huge improvemt on MGP. Before replacement I was having 10-13MPG now on highway at 65-70 I am getting 18MPGs. I am so happy with my work. Its a pity we are leaving on differen continents. I would hug You ;)
Good to hear you were able to fix your issue and our video assisted you. Thanks for taking the time to comment. We appreciate it!
Just did this job right now, thanks for the videos yall make Timmy and Shawn, i learn alot from them. The results for me were a success.
Good to hear Israel. Glad you had success with this job using our video.
Hey Tim thank you for this detailed instruction.... Your videos are probably the best in their applications and detail! Take care brother! 👍🏞🏜
You're very welcome and we appreciate your compliment. You take care as well.
Thanks for putting this video together. Had to replace the forward o2 sensor on my '98, and this showed me exactly where it was. The flex-head ratchet suggestion made the job a lot easier in the tight space. I still had to fix that the PO put 2 SAE nuts on one of the studs (one too large to touch threads, and the other clamping it down, but screwing up the top threads on the stud), but that's what tap & die kits are for, and even that wasn't hard. The guidance was much appreciated.
Previous owner put SAE bolts in?!? Some things people do is unreal man. Thanks for taking the time to comment and adding your experience to hopefully help others. We really appreciate it Jonathan!!!
You are a true professional, explaining and working. My sincere congratulations.
Thanks Ramon. We appreciate the nice compliment. Happy Wrenching!
Followed this step by step and the CEL on my 99 SR5 is gone!!! Love this channel
Glad this worked out for you Tito. Thanks for taking the time to comment. Happy Wrenching!
Thanks for your video!! We need more people like you videoing and explaining your job. Thanks !!!
You're very welcome and thanks for the kind words. Happy Wrenching!
Very thorough, I learned and also subscribed, great video!
As always great video and thanks so much for sharing your experience. I replaced the O2 sensor, cleaned MAF and still got the CEL. Finally replaced the oily crusty PVC valve. No more CEL and better gas mileage.
Good to know you figured out your issue and improved your mpg.
I just replaced both sensors and it wasn’t too bad. I have a 2002 4Runner SR5, 4WD with 156,000 miles. My specific part numbers are Denso 234-9002 (upstream) and Denso 234-4261 (downstream). All in, it was about $189 which is a far cry from the approximate $800 quote I got from Toyota, wow! Timmy thank you so much for your videos, everything is explained so well it which makes it very doable. From the time I got my truck on ramps to putting my tools away it was about 1.5 hours. Just took my time and had patience getting off a few of the nuts being that everything was original and I live in beautiful Indiana with salty roads!! Anyway thanks a ton TT , do this job yourself guys and save a ton of $$$ and have the satisfaction of doing it yourself!!
Hey Tom, glad the job went well for you. $800 is a crazy amount for this job. I bet it felt good doing your own work and knowing all the money you saved yourself. Great job and you're very welcome. Thanks for taking the time to comment and share your success story with us. Happy Wrenching!
All videos should be this good.Thank you
Thanks! We appreciate the compliment.
4 years later...my have times changed. $193 just for the upstream sensor. THANK YOU for saving me a lot of headache. I have a 2000 gen3 4runner (original owner) that I purchased in AZ, it has the CA emissions sticker under the hood. A lot of the parts stores do not even acknowledge this detail, and would have ended up getting wrong part.
You're very welcome Curtis.
That's likely because yours is the CA model. I just bought both upstream & downstream from Amazon, DENSO brand,, for $124 tax & shipping included.
@@janaemcdaniel6596Hi. I just bought my upstream from Amazon at $150 alone. Auto parts were charging $200. You got a deal.
I changed upstream to clear code p1135, but now I’m getting code p4020. I’m going to change the downstream hoping that will clear the code. Crossing fingers it’s not a bad cat
I have a 98 4 Runner and live in the rust belt of WNY, but the vehicle originally came from Canada. I'm doing a cat back exhaust replacement tomorrow and was curious about the O2 sensor removal. Very informative video.
Good luck with the job. Glad you found the video helpful.
Thanks to your video, I just replaced my upstream and downstream O2 sensor on my '99 4Runner and I feel like my truck has become more fuel efficient. Living in Canada, my downstream O2 sensor gasket was rusted after 20 yrs. My next project is replacing rear wheel seal...I'm watching your video multiple times. Keep up the good work!
Hey Action Jackson, you're name wouldn't be Carl Weathers by chance, eh? Good to hear our videos are helping you out. Good luck with the rear axle seal job. Happy Wrenching!
Have the exact same story. No rust on my truck whatsoever, but the downstream was rusted and corroded and crumbling. The new o2 sensors made a gigantic difference.
found the info i needed in your video description! was worried I didn't get the right sensors but mine is a '96 and I have two of the same 02 sensors so I should be all set. Thanks for all your help!
Glad our video could help you out Caleb. Happy Wrenching!
Thank you so much for this video متشکرم از شما آقای محترم
👍🏻
I’m having the same problem with my 95 4Runner, I think I might follow your lead and replace my sensors as well I’m getting around 15 mpg on a good day lol
toyota tim you are the man, as always.
Thanks Ty.
Gonna do the down stream on my 02 tacoma and my mechanic suggested to use a 6 piont on the bolts to lessen the chance of stripping. Thanks for the video.
Hey John, yes, a 6 point socket or 6 point box end wrench will definitely lessen the chances of stripping one of the nuts. Your mechanic shared good advice. Make sure to pretreat the nuts with some penetrating oil especially if you have some corrosion. Good luck with the job and Happy Wrenching!
I just did the AFR on my Tacoma. The nuts seem to be made of a softer than normal metal. Make sure whatever tool you decide to use is fully seated on the nut before applying torque.
DoubleHaulCharters thanks for the info.
I have an old LS400 with 300k miles and it was burning more fuel than my Land Cruiser. LS400 dual exaust and it has 4 O2 sensors. Before replacing sensors it was doing 6 MPG after O2 sensors now the mileage has greatly improved.
That's good to hear it worked to improve you mpg.
Excellent explanation of maintenance service, well done!!
Thanks Bill!
Thanks Tim, I changed both O2 sensors today in my '03 Tacoma. Easy-peasy after watching your video. No more check-engine light. I always search your channel before any repairs. Cheers mate!
Glad our video helped you out Damien.
Terrific video - thank you!
Thanks and you're very welcome.
Timmay, to speed up the EFI recalibration you should pull the EFI fuse for an hour or so. This will erase all data it's using and start you fresh. Good video, and good information all around!
Thanks for the tip. Glad you like the video.
thank you for the great video!! I have a 2004 Tundra and have to bank 1 sen 1 out so I'm doing this very thing. So cool you show just how i'm going to have to do it!! Thanks
You're welcome and glad you like the video. Good luck with the replacement.
Did it clear the code? I have the same problem with my 03 Tacoma and after changing the sensor it came back on after a few miles. Not sure if I should change the down stream co2 sensor as well?? Any help I’ll greatly appreciate it
I want to also add that I cleared the check engine light with an obd scanner, idk if it might be better to disconnect the batter instead to reset the whole system?
Good Video ! Thanks You always inspire me to do the job wright!!!
Thanks Anthony.
I'm swapping out the O2 sensors as a last resort to fight my high Idle on my '99 4 rnr. I was chasing a mis-fire and tried Seafoam and the idle bumped up and has continued to climb to 1400-1800 rpm. I have new TPS, IAC, spark plugs and wires, fuel injectors, gaskets, MAF sensor, new hoses from smoke test for vacuum leaks. temp sensor check out OK. No slop in throttle body input shaft.
THX for all the great videos,
lungfish
Hope you figure it out.
Did you find the problem? I just watched a video with the same high rpm problem and it ended up being a bad thermostat not allowing the coolant temp to get hot enough to tell the IAC to close and lower the rpm.
Thanks!
You're very welcome!
If you have a graphing scan tool, monitor both upstream and downstream O2 sensors. If the downstream sensor mirrors the upstream the CAT is dying. The downstream sensor should be steady in its output, as it reports to the PCM how the CAT is responding. Great video as always my brother Tim!!
Thanks for the info Brother Jake. I have that Torque Pro app but I don't think that would offer the information you're talking about. Somebody else mentioned using Techstream but it requires a windows based operating system and all I have is a Mac now.
Timmy The Toolman Any hand held graphing scan tool, $200-300 range would work.
Gotcha. I'll have to look into finding a good one.
Keep up the good work
Thanks, we will.
Love seeing your rust free vehicles. A little jealous too:)
Yes, we are spoiled in the California Bay Area.
Go to South Main Auto. That guy works in New York state. I find it unbelievable how much rust can build up every where.
@@Rhaspun same here... it's that liquid Acid they put down here..Everybody leases here! Those of us who like to keep our autos are screwed.
Same
@@tynado1173 I'm re doing my exhaust so i'm going to replace my sensors anyhow. The current one is melted on with rust.
Great video as always!!!
Thanks!
Awesome video. Very helpful thx
Glad you found it helpful. You're very welcome.
Excellent video as always! Great job!
We're glad you think so. Thanks for taking the time to comment.
Another excellent video. Such a clean underbelly compared to here in wisconsin. Thanks!
Thanks Dan, We're glad you like the video. Yeah, we don't deal with rust in the Bay Area of California. You're welcome and thanks for the comment.
Just done this on my 04 v6 Manual trans, the sensor was easy to unbolt but getting the wire harness unplug took me a while,the wire went up above the trans I couldn't see so had to do so feeling around I guess Auto and Manual trans are lil different thanks for sharing the info about the downstream and the vid
Those connectors can be a pain in the butt to disconnect. Thanks for the comment and you're very welcome.
Same deal on my manual T100. The connector is mounted on top of the tranny.
Nice camera bud, made the procedure look much easier
Good to hear Chazz.
I've got to do this to my 99 SR5 Highlander edition. It's 48 state Federal living in the great state of CA, you don't even want to hear my unnecessary California Smog issue story. But, it's been getting poor MPG, like maybe 15. I've been trying to figure it out, stumbled onto the O2 sensor idea in a forum, and thankfully the great TimmyTheToolman has addressed it in a video. I'm hoping to get at least 2 MPG more after this. It's running slightly oversized tires, but has been since I bought it 10 years ago.
Hopefully it improves your gas mileage. Let me know how it turn out. I think mine improved a little but it's hard to say how much.
Will do. I'm going to take a few tanks and get a good avg. mapped out. Will try to get an idea of specific Hwy avg. too. But I've been trying to figure out my MPG drop off and on for a while now. Was considering the deckplate mod, and even bought an Airaid wondering if the cracked rubber on OEM intake tube was a problem. It's been tuned up, cleaned up the throttle body, MAF etc. I'm hopeful with the O2 sensor/s, just deciding weather to do both. Might as well I guess. 177k, from Utah, so salted roads, and Sacramento summers. These 3rd gens are tanks, but I am eyeing a LX470, or newer 4Runner. With my mileage so poor, a LC or LX isn't much different..
@@TimmyTheToolman It seems to just be the driving conditions for my MPG. Recently we took it for a longer, mostly freeway trip and got over 20 mpg with 90% HWY driving. So I have determined it is the driving conditions. Seems to get 14.5 - 16.5, with mostly city z 60% city, but over 20 mog on the HWY. So I am leaving the sensor alone for now. Mine is aeruouslt rusted, so not worth the trouble unless malfunctioning.
Hoping for a door lock actuator replacement video, with the cheap motors instead of the full part. My Drivers lock is failing, particularly if the door is getting direct sun. There are write ups on the forums. But I imagine a lot of these are starting go out at this point. Could be worth a video for you, maybe not? Anyway thanks for your vids, they are above and beyond the best... I'm hoping you get into 100 series Landcruisers next, I have been eyeing LX470'S lately..
Yeah, probably a good idea to leave that sensor alone.
We will definitely be doing a driver door lock actuator sometime soon. I need it on my 98. My door lock doesn't always open all the way. It closes fine though. Glad you think so highly of our videos. I would actually like to own an old FJ40 or a 1st Gen 4runner.
Great video will try it on my truck.
Glad you like the video. Good luck with the job.
Well done!
Thank you.
Thanks Zac. You're welcome.
It always seems you do your videos at the same time I need them. I just had a code come up for my downstream 02 sensor. Last time it was timing belt and water pump. Great Video
D Miles good luck and happy wrenching! I hope our next video comes as timely as these as well!
Timmy The Toolman , I live about 5minutes from the Atlantic Ocean. The bolts are soooo rusted theres no threads on either one. Any suggestions
Sounds like you need to go to a good muffler shop and see what they can do for you.
You always look blazed 🤣
Not me. I don't smoke the Devil's Lettuce. I do drink though, but usually after the video, not during.
Thank you so much!
You're very welcome Greg.
Thanks Timmy I'm doin mine now
Hope it went well for you.
Thanks !👌
You're welcome.
Anti-seize on the threads of the mounting studs before putting the nuts on helps the next time the nuts are removed.
Yeah, I agree with that. Thanks for the comment.
I had to have a new flange made at the exhaust shop. Those studs rust quick. The one they made for me used bolts instead of studs which should last longer with stainless steel bolts.
where do you live?... mine came off without a problem... didnt even use penetrating fluid
Good video!!!
Thanks, glad you like it.
Timmy - why didn't you go for the trifecta and clean the throttle-body too. Great walkthru on the O2 replacement. I had to replace the downstream on my 3.4 liter Tundra because the heater element died.
My throttle body was already clean from a recent valve cover gasket job. But yeah, not a bad idea to clean the throttle body and also clean the IAC valve.
Hey Timmy,
My check engine light came on giving me a code that my rear 02 sensor was the culprit. Quick look underneath and saw that studs were extremely rusted. Brushed them off with wire brush and sprayed them with PB blaster. First nut came off no problem, second nut came off easily to halfway, and then nut started to really make a screeching sound when I turned nut. I would go back and forth with nut spraying with PB blaster and as I got to the last quarter inch the stud started spinning no matter the direction I turned, and then the stud broke off flush. I put new 02 sensor on with one nut and clamped the other side down with a hose clamp as a temporary fix. I turned over 4Runner to see if I could feel any leaks and discovered about three inches in front of 02 sensor on top of the muffler piping there was a nice size leak.
Then everything started to make sense. My muffler had to be replaced about a year ago and the muffler shop ended up having to weld the forward muffler pipe to the catalytic converter pipe together because they said the flange rusted out. Well the leak I’m experiencing is exactly at the weld on top of the pipe which is located three inches in front of 02 sensor. I remember the mechanic calling me saying I’d probably have to replace my 02 sensor. I thought at the time how the hell did that go bad. While at that time I had no idea what an 02 sensor was so I asked how much and once he gave me the price I said to hold off if the one is still good. He said he could try putting back on but most likely will have to be replaced soon. Well a few weeks go by and sure enough my check engine light comes on. Take my vehicle to a shop and they confirm my 02 sensor was culprit. They reset check engine light code and said it would come back on most likely and sure enough it did.
I then started watching your videos performing maintenance myself saving a ton of money, learning about my vehicle, and slowly acquiring lots of tools. I eventually got my own obd2 reader to monitor my coolant and transmission temp after I installed a cooler as well as used it to check/clear codes specifically the 02 sensor that kept tripping. The only reason I put off replacing 02 sensor for so long is because of all the rust. Anyhow after breaking my stud off I suspect there was no issue with my 02 sensor in the first place and it was the leak in my pipe a few inches ahead of the sensor. Now almost year and half later I am going to call the shop explain the above to them and hope they’ll repair leak in pipe and weld on a stud for a reasonable price considering the circumstances. I am confident that their poor weld job was tripping the 02 sensor code in the first place and they just reset the code before giving my 4Runner back to me.
If shop is not willing to offer a reasonable price I might just order everything ahead of tail pipe and replace it myself. My concern will be removing pipe ahead of the cat because of all the rust! Do you see any other options?
Replacing the exhaust manifold on that side might be your only option if it can't be repaired by the muffler shop. I haven't pulled off the exhaust manifolds off an engine inside an engine compartment yet. The only ones I've removed have been from an engine that was already pulled out from a rig. It might be a little tight getting to all the fasteners but I think you shouldn't have too much problem. I guess the rusty nuts would probably be the biggest concern.
Oh wow very good video I have a 1998 Toyota Camry V6 3.0 and im getting ready to do the other upstream 02 sencer cause the same thing my gas mileage is not that good I think it can get alittle better. Plus on my scan tool all the monitors are good but my 02 sensors one is saying incomplete. Bank 1 sencer 2 has to be changed im pretty sure, but my Mechanic is gonna put the scan tool with live data on tomorrow to make sure I change the right sensor. And hopefully my has mileage will go back up, and im gonna have him spray the mass air flow sencer as well
Good luck with the job. Hope the O2 sensor swap fixes your issue and improves your gas mileage.
@Timmy The Toolman Thank you brother
@@williamavery1758 You're welcome.
I think one of my friends got changed 212$ to get the part and labor on his 00 Tacoma to change one o2 sensor . I can’t believe it was this easy
Hey Daniel, a lot of auto mechanics is pretty straightforward like this job is and it is surprising how much a shop will charge you for something that takes them 15 minutes to replace. This is one of the reasons why we are trying to empower people to do their own work. The other reasons are it's a good learning experience and a skill you can use over and over again, and then there's the great satisfaction you get when you successfully perform a job. Happy Wrenching!
Great video. Very informative. So I will be replacing the o2 sensors on my 97 4runner. Got a system too lean code and My question is how can you tell the difference between the upstream and downstream sensor? I don't want to mix them up when I replace them. Thanks!
Well, just replace them one at a time and you can't mix them up. They have different part numbers so keep them in the box until you're ready to install them.
OMG I SAW YOUR VEHICLE ON BASCOM AND HAMILTON! YOU FAMOUS BRUH!!
Well, howdy neighbor.
Thank you for the plethora of information! Great video! My mpg is garbage for my '03 SR5 (about 13/city), but of course I have lots of overlanding weight added (skid plates, rock sliders, roof rack, bigger tires, etc.) Evem though I have no codes thrown, I'm wondering how much ROI in mpg I would get for spending $350 on new O2 sensors ('03 takes 2 upstream, 2 downstream.) Is it worth it?
Hard to say if it's worth it Chris. These rigs get crappy mileage when they are weighted down. If anything, maybe just replace the upstream sensor because that's the air/fuel sensor.
When I removed the gaskets my tacoma, they too were on backwards. I’m not sure if they were changed at some point or if that’s how they came from the factory
I wonder if the gasket orientation even makes a difference. It might not.
Hey dude.. just a question with a multi meter Do you have any idea what the resistance of the bad sensor vs a good one?
Hi Timmy,is there a drive cycle instruction procedure on your manual to reset the catalyst monitor? seems like alot of people are having trouble activating their catalyst monitor sensor after disconecting the batery and there is a debate on how to activate your I/m monitor sensors for a smog check. if you can answer this question and make a video I think it will help a lot of toyota owners and thanks for all the awesome videos you have made.
Francisco Valle if I remember correctly from a recent smog on one of our many 4runners, the procedure to reset the emission systems basically requires you to drive at or above 55 mph for 20-30 minutes. Sean has recently replaced an 02 sensor and took it to the smog shop and they said the system want ready yet and to drive it for 30minutes however we learned later that it’s 20-30 minutes at approximate highway speeds.
I'm just throwing this out there, someone may actually have an ansr to or at the least a great suggestion for repair. My dads 2002 toyota 4runner had the TRAC OFF and the VSC TRAC light on without the check engine light. I simply disconnected the negative cable for a few minutes and put it back on, it cleared the lights. But in the event that they possibly return, would anyone have experienced this or just know what could be a route to take in clearing them permanently??? Thank guys! And great video, Tim. Keep up the great work!!!
Hey Israel, I don't have personal experience diagnosing this issue but I do know it's come up on T4R.org. I think a Google search will bring you to several forum threads on the subject.
I know you’re really good at answering questions when you’re able to when you have the time really appreciate the videos to I’m over here in New Hampshire Jerry’s got a Camry we just ran into the California situation with the Cadillac converter the exhaust is rotted the converter still good anyways I have a 02 Tacoma fortunate that the salt hasn’t gotten to it I keep it under coded got it in good shape anyways the door tag says California but underneath the hood on the left side it says Canada I’m not sure how to find out about the O2 sensors And if we have to go with a California O2 sensor or if there is even The same situation with emissions I guess on what part of the tag would tell you the mechanic figure it out the California thing with Kari’s car thanks again for your time
So the emissions sticker under the hood says it was built to Canada spec?
Thank you for the video. I have a problem with rust on mine. The nuts are completely rusted and stripped. Any tips to get them off?
Heat, penetrating oil and see if you can clamp onto them with some vice grips to spin them off. They also make nut and bolt extractors like these that would be the right tool for the job.
Bolt Biter Extraction Socket Set amzn.to/32YpFOh
Their are these extraction sockets they sell at Home Depot give those a try
Hi Timmy,
First, Thankyou for all the amazing videos. I owe you for all the money I've saved. The rear main seal being the biggest job so far.
I have a 99 T4R V6 4WD Auto, I'm in Canada and only have one CAT. when on the Denso site you linked should I go for the Exc. Calif upstream and downstream? any Help is very appreciated :)
Mat
Take a look under your hood at the emissions sticker. It might say whether or not your rig was built to California emissions spec or not.
Great video. The content was good, the Sound quality and Video were spot on. I had one question about my 2002 Toyota 4runner. My engine light vsc trac vsc off were on, I got the engine code and it was Bank1 Sensor 1 O2 Sensor. I ordered and installed a "Denso" replacement, the lights went off but now I get a stutter from the car. It feels like a loss of power and a hesitation. Would I need to look into the Mass Air Flow Sensor? or tune up post O2 sensor install. "Back Story----->" Sensor was bad for about a month, I didn't have money so I couldn't replace it. Car was a daily 20min round trip driver that ran solid before and during the lights being on. Any help would be appreciated, thanks in Advance
Glad you like the video. First, I'd just double check you got the correct sensor for your year and transmission. Was this the upstream or downstream sensor? If it's the upstream, it should be an air/fuel sensor and not an O2 sensor. Also, other manufacturers will list the associated Denso part number but the sensor isn't a Denso. Is the one you got a Denso sensor? People have had problems with non-Denso sensors.
If you indeed got the right sensor, starting with a cleaning of the MAF sensor sounds like a good idea. With your O2 sensor bad, the information reporting back to your ECU about air/fuel mixtures wasn't correct. Now, with a dirty MAF, you could be running too lean. I'd also clean the throttle body. Don't just shoot the throttle body cleaner in there and let the dirty run-off drain into the IAC because that can cause you more problems. Spray some throttle body cleaner on a rag and wipe out the black deposits on the inner bore and baffle. You can pick up MAF cleaner and throttle body cleaner at any auto parts store.
Timmy The Toolman ppl
Nice video I need to replace a o2 sensor on 97 4runner limited 4x4 is it the same part number as yours
Glad you like the video. Good luck with the job.
Good video, I have a 0420 code on my 03 tacoma. Have tried sea foam in every way , crakecase, gas, and air intake . The code came back on though, I'm thinking of replacing the up stream o2 sensor, which read 3.00 vts . What you think, thanks for your advise . Kg
If the ohms resistance is out of spec for the O2 sensor, then I'd replace it. I do think a P0420 code would be more of an issue with the downstream sensor. If it's neither the upstream or downstream sensor as the culprit, it may be a situation that you have to replace the catalytic converter. But, if it were me, as a last ditch effort before having to replace a very expensive catalytic converter(s), I'd try a product called Cataclean. It's got mixed reviews but maybe it will work to clean out a partially blocked up catalytic converter and allow the code to go away and you can pass a smog inspection and get your vehicle registered.
I seen you do work on the 4.7. Was wondering if you have or know how to get the complete wire diagram for the O2 sensors on the 4.7 06 4Runner.?
You'd have to buy a subscription to Toyota Tech Info. I buy 2-day subscriptions and download what I need. techinfo.toyota.com/techInfoPortal/appmanager/t3/ti?_nfpb=true&_pageLabel=ti_home_page&goto=https%3A%2F%2Ftechinfo.toyota.com%3A443%2Fagent%2Fcustom-login-response%3Fstate%3DshJX0Ta1BXIK0Y3GK5F26E-qIeA&original_request_url=https%3A%2F%2Ftechinfo.toyota.com%3A443%2F
Tim, I know this isn't the subject of this video, but it's nearby. I suspect maybe my Catalytic Converter is bad, I'm suffering a loss of acceleration/power. I don't suspect an engine problem. The 99 4Runner with 3.4L has 380,000 miles on it with the original Cat. Would that mileage alone be enough for the Cat to fail, or would there HAVE to be some underlying problem? Voltage fluctuates below .7v. I know that is a symptom. I'll do a temp test next. Is age alone enough for failure? Thanks!!
A good muffler shop can tell you if you have a bad cat. They drill a hole and put a probe in to figure out if the cat or cats are bad.
Timmy i went to denso website & put in my model,year & motor size. Im having a p1135 code. But it doesn't ask if its a California emissions or not. So just order the upstream one. Thanks
You're welcome. Hope it fixes your issue.
Question: I ordered the correct part for my 02 4R and it does not come with oval plate attached to it?! Toyota says it’s the right part... it appears to just thread in. It’s Denso oem. Have you heard about this? Did they change the 01-02 O2 sensor?
That's weird. As far as I know, none of them thread into the exhaust, they bolt onto it via the studs sticking out that the oval flange of the sensor slides over and the nuts secure it. Sounds like you got the wrong part. Did you look up the part number via the Denso link we provide in the video description? A quick look under your rig will tell you if our original sensors are just like the ones we show in the video. But again in our experience even the 01-02’s have the oval plate gasket to ensure there isn’t an exhaust leak for both the O2 sensor & the air to fuel ratio sensor.
Great video Timmy, very informative, clear and concise. Is there any chance you can buy just the gasket for the downstream O2 sensor somewhere? Or would I need to purchase the whole sensor? I'm planning on replacing the exhaust from the cat all the way back on my 03 Tacoma 3.4l and I'd really like to re-use the downstream O2 sensor because it appears to be in great shape, however I know you're not supposed to re-use the gaskets. If I could just get the gasket that would be great. Thanks
I don't know if you can buy just the gasket because I've never tried. You could visit your local Toyota dealer and ask them or possibly an auto parts store might carry it like O'Reilly's.
Ok I'll give the local O'Reilly's a try. Thanks@@TimmyTheToolman
I have a 4th runner from 2000. there is another cube in the sensor behind the catalyst and before. I think something is wrong. do you know this problem. Thanks
I'm not exactly sure what you're saying. I don't know what you mean by "cube in the sensor". You will have two sensors, one upstream of the catalytic converters and one downstream of the catalytic converters.
I loved watching your video. I got a 97 4runner limited with 178,000 miles in it. I went for my biennial smog certification at a star certified station and it failed because the NOx was too high. The mechanic told me that it might be the oxygen sensor. My question is do I need to change both sensor or I can do with the upstream sensor only. One more thing Timmy, I tried another Star certified smog station because I wasn't sure about the first one maybe he just want to rip me off with unnecessary repair and sure enough my truck pass the inspection.Thanks for any reply.
If you decide to replace one sensor, I'd suggest going ahead and doing both. That was smart of you to try out a different smog station.
@@TimmyTheToolman Thanks for the good suggestion. You're the man.
@@luisolitoquit4481 You're welcome Luis.
Can a leak near(collector area) a Cat cause the engine light to turn on. Our local Autozone guy says its the O2 sensor that needs to be replaced?
An exhaust leak could definitely be the cause for a CEL code to arise.
Hey Tim, I live in the great rustbelt state of NJ and have rusted bolts on my upstream o2 AF sensor. 12mm has morphed into something my tools can't get a grip on. With limited space, any ideas on how I can get these rusted bolts off without damaging the threaded stems?
Thanks, Joe
Maybe some small vice grips would fit.
ive been having trouble disconnecting my o2 sensor from the harness, ive used some pliers to hold the release tab but no luck releasing the sensor, any ideas guys?
These connectors can be a bear sometimes. I've struggled with them myself many many times. Just keep trying and don't break the connector. You have to be careful when using pliers because you can easily crack the connector.
I have a 2000 Toyota Camry 2.2 l 5sfe motor O2 sensor looks like the one you have in your hand but I could not find one in a parts store in Australia looked online and found something similar that fitted 100 series landcruiser in America I think it's called an E300 not 100% on that one but it said it would fit the land cruiser as well as a Camry is this true
I have no clue. I suggest you look up the part on the Denso Find my Part website we link in the video description and find the correct sensor. You'll get results for the upstream and downstream sensors so be sure to pick the right one and then use that part number to search for it online. Amazon will most likely have it.
Anybody have the ohm value for testing to see if you have a bad o2 sensor
Hopefully I'll pass the smog check after changing the two 02 sensors
Yeah, fingers crossed it works out for you.
When cleaning the surface for the o2 sensor, did you cover up the hole or no
No, I didn't cover it. If you have big pieces of gasket to remove, it might be a good idea to cover the hole so the debris doesn't get stuck either in the catalytic converter or muffler.
Not what I'm looking for, but I'm looking for a video of replacing the abs censor on 2003 Tacoma front left. Thanks for any help.
We don't have a video for it but its should be pretty easy. The sensor plugs into the knuckle and is secured with a 10mm bolt. You would disconnect it there and then follow the line up until you can find a connection you can disconnect. If it were me, I'd try to find one at a wrecking yard like PicknPull and grab one off a wrecked 1st Gen Tacoma or 3rd Gen 4runner. We do have a video that shows how to disconnect the sensor from the knuckle. In this video, ua-cam.com/video/-sY2azyLBuI/v-deo.html, go to play time 6:11 and you'll see how we do it.
Correct me if I'm wrong but I looked up on All Data my codes which are P2241 and P2238 for my 03 4Runner sport. Those would be the sensors right next to the manifold on the 4th gen correct? And they're upstream AFR sensors?
Hey Fredy, I found this link and I think you will find if helpful: www.autocodes.com/qa/51208/what-do-codes-p2238-p2241-mean-for-2004-toyota-4runner-sr5-v6
What happens if I cut the wires and reconnect the wires to a different plug? Is the sensor going to work the same or not?
As long as you connect the wires correctly, it will work.
If second o2 sensor just for monitoring, what doing if there only 1 sensor. On my 3rd gen Surf 3rz-fe 1999 its only one, and its downstream. Is it only for monitoring or used to cause mpg?
It's probably doing both. Monitoring the exhaust gases and sending that info back to the computer so the air/fuel mixture can be adjusted for better performance and mpg.
I got a check engine light saying I need to replace upstream o2 sensor but when I did replace it and clear the code/reset ecu by disconnecting the negative battery terminal , the check engine light came back . So I exchanged the part at AutoZone n did the whole thing again n the check engine light still keeps coming on for the same code , would you know why?
I highly suggest you get an Denso sensor for your vehicle. Denso was the OEM manufacturer for sensors for many different make and model vehicles. We provide a link in the video description to the Denso website. Find the part number you need and then do a search on Amazon for the sensor and buy it. People have had problems with air/fuel and O2 sensors bought from auto parts stores.
Tim, thanks for what you do. Your my go-to-guy on You tube for my 2000 Tundra. I have over 420,000 miles on it. I drive the hwy everyday. My 2000 Tundra V6, we have a code of P0125, (Sufficient Coolant Temp for Closed-Loop Fuel Control) The dealership replaced the Thermostat and Coolant. However, after 1.3 miles the check engine came back on. They check again, the same code came up. I'm thinking maybe, the top engine ECT Sensor or the bottom Oxygen Sensors ? Your thoughts? Also, Tim you were going to list the web sight that you use to find parts, or part number less cost than what the dealers uses. Dave
I haven't troubleshooted the P0125 code before so I wouldn't be much help to you on that issue. Doing a search for the possible causes and diagnosing the easy things first to rule out is what I would do. In the video description, we provide a link to site to look up the part number for the O2 and Air/Fuel sensors. Once you have the right parts numbers, just do a Google search and you'll probably find the sensors you're looking for on Amazon for a fair price. When I'm buying Toyota OEM parts, I usually use Camelback Toyota in Arizona. Their prices are competitive and they ship quick. Amanda is in charge of the online sales for Camelback and she's really helpful.
Tim, please let me know when you feel more confident on that P0125 Code. This light came on two weeks ago. It was a hot muggy day. I changed out air filter, fuel cap, cleaned the master air censor. However, after visiting a dealership read a P0125 code and that is all. We all thought the thermostat is opening to soon. We replaced the Thermostat and Coolant. Reset the computer, and light came back on. I think we are all puzzled. I could replace the ECT Sensor, and reset the computer. About a 3 hour job. Its located on the very top of engine, right behind the Timing Belt Cover. Please let me know your thoughts. Dave
@@daycinvac Ok, if I ever troubleshoot this code, I'll let you know what I come up with. But, a quick search on this problem pointed to the Air/Fuel and O2 sensors being bad. You can test them but with 420,000 miles, I'd say just replace them. I did that on my rigs just for the chance that it might improve my gas mileage and improve the performance of my engine. These sensors can get "Lazy" and not work as well. Check this video out and make sure to rear the video description: ua-cam.com/video/CtngAVxJxkE/v-deo.html
Having trouble getting the bolts removed on a 98 4runner. Any advice? Thanks for a reply.
Heat from a butane torch and penetrating oil. Keep repeating until you get them loose.
Sorry to be elementary, but do you need to disconnect the battery before you start? Also, is there a way to feel the 14 fp without the torch test tool?
When disconnecting electrical connectors, it's never a bad idea to disconnect the battery. I'm sorry, but I don't understand the second part of your question.
Do you know of a good torque wrench that you would recommend in the 10 to 150lb range?
The CDI we link in the video description is a good buy.
Is Denso a recommended brand? When I look up O2 sensors I see a brand called Moca with quite a few options. And the pricing isn't as much.
You should only consider DENSO. That is the OEM spec.
- Sean
Should you remove the negative battery terminal first before changing the O2 sensor?? Just saying...
You could but it's really not necessary for fear of shorting something out. I don't know if one of the wires in these plugs has a 12V constant, but even if they did, you'd have to try to ground it out since the connectors are recessed in the plugs.
It would be beneficial though to reset the ECU so the computer will more quickly adapt to the new readings it's getting from the sensor. So, for this reason, disconnecting the battery and resetting the ECU would be a good idea. Thanks for the comment.
On my 2000 Tundra the downstream O2 sensor on passenger side. There isn't a nut on the bottom from the corrosion the top one is corroded so bad I can fit a 10mm socket on it fits to an extent, it's like half a nut holding onto the bolt. What do I do? I can't get it off for anything.n
With that level of corrosion, I think going to a muffler shop might be your best bet and see what they think is the easiest and most affordable fix. With the stud gone on one side, even if you got the other nut off, you won't be able to get the new one properly secured.
Hey everyone!
TLDR: can you remove the catalytic converter?
Really need some help and advice. My mechanic has recently told me that the converter is clogged on my 02 SR5. Didn’t mention a code or anything to with any sensors to my knowledge. I’ve heard on some 4Runner Forums that you can gut the converter all together, but this confuses me as 3rd gens have an upstream and down stream 02 sensor as the video shows.
I have heard you can make an incision in the pipe between the downward O2 sensor and the catalytic converter body and basically stuck something up there snd bang everything out. Is this true at all?
Thanks!
Hey Doug, I can't advise you on what you're asking because I know nothing about it. But, I've heard of a product called Cataclean. Here's a link: www.amazon.com/Cataclean-Catalytic-Converter-Cleaning-Treatment/dp/B002BVXM92 If I were facing a catalytic converter problem, this is what I was planning on trying before dropping the coin on a new converter. I live in the People's Republic of California and I don't think I would pass emissions by gutting my cat. I would think you would throw codes if you gutted your cat from the readings your downstream O2 sensor would be picking up.
How does your mechanic know it's clogged? If you're not throwing any CEL codes, why do anything? Is your rig running poorly?
Both O2 sensors on my '96 T100 V6 are original, 128k miles. The nuts are so corroded I've had to order the upper exhaust manifold/catalytic converter pipe as well as the cat. Will have a muffler shop finish the job.
Yeah, a muffler shop can install a new O2 sensor bung for you if rust has eaten up too much of the studs.
both 02 sensors on my '97 Taco 5VZFE MT are original at 344k miles... had a clutch job done and rebuilt R150F that took 12 weeks to complete with exhaust opened for removal/assembly of the clutch... got the truck back and NOW get 50 miles LESS per tank... is it these 02 sensors? truck has No CEL triggered
@davidpenney4171
@@efil4kizum Calculating by tank is not the most accurate way to determine mpg. You fill your tank, reset your trip odometer, and then drive. On your next fill up, you divide the miles you drove by the gallons it took to refill your tank and that's how you properly determine mpg. If you're O2 sensors are original, it wouldn't be a bad idea to replace them. There's no guarantees it will increase your mpg, but there's a chance it will.
@@TimmyTheToolman thank you for the instruction on the best way to measure MPGs... here is how i do it for decades on this truck with an ongoing ledger... i wheel it until the low fuel red light comes on... wheel another 20 miles or so to the next spot for some fresh tacoJuice... fill up until the pump handle clicks. keep pumping the juice in slowly to round it up... i can usually fit in more than an extra gallon before fuel starts spitting back out at me LMAO... Many will frown upon that method but i have YET to find any issues doing this over 200k miles of doing it that way... then normal driving (mostly freeway at 65 to 80 with an occasional 95mph when it needs the exercise) yields very close to 360 miles before the red low fuel light has triggered for 20 miles... now it barely gets to 300 miles on that tank over the past 2k miles... this is called the hardcore TacoLife living midWest style... i wheeled it through the heart of Minneapolis on i94 this week and did NOT SPOT 1 Gen1 Tacoma nor Gen3 T4R... its very sad to be all alone out here in the rusty crusty saltbelt 8^(
Job completed, and check engine light is gone. I had to buy an aftermarket catalytic converter and down pipe from the manifold, both discontinued by Toyota. So this was an expensive repair.
Are the 2 Denso sensors that you put in the description compatible with a 1999 4runner 3.4L 2WD?
I don't know. You'll have to look it up on the Denso website we provided a link to.
Tim. The Denso website doesn't show a diff O2 sensor for Kali versions for 01 or 02 trucks
That's because by that time, trucks across the country were all built to the California spec from what I've heard.
Yes I ordered this one for my 02 and there is no oval plate attached. Just a threaded sensor...
Timmy,
I picked up a 97 with 175k miles and it does not have not the most detailed service records. I had the sparks plugs changed recently by my mechanic. I want to tackle the O2 sensors and MAF, but I also saw the Seafoam treatment you did on your 2000. Would you recommend doing the Seafoam first before changing the O2 sensors and cleaning the MAF?
If would do the seafoam treatment first. You're introducing the seafoam directly into the throttle body so you could clean the MAF before or after because the seafoam isn't going to contact it.
@@TimmyTheToolman Thank you very much.