Disconnecting The 02 Sensor Made This Corolla Run Like New Again!! 1999 Toyota Corolla

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[@mostlymoparih5682]

You hit the nail on the head. Years ago when my son was going to college, the 89 Aries he was driving needed to go through inspection and when he took it through it failed for emissions. So I went to the Chrysler dealership where I knew a mechanic and the parts guy. I asked Jay the parts guy for plugs, rotor, cap and wires and before he wrote up my ticket, John, the mechanic asked me what was up. After I told him that I was doing a tuneup he asked me if I checked for any codes. No I didn't. He told me go out and check first before you buy all those parts. I did and it called out the O2 sensor so I pushed the parts back to Jay and said I'd like to trade these for an O2 sensor. The price was about the same but the parts I first asked for would not have fixed my problem. Car passed inspection and my son got better fuel mileage on his way out to Valley Forge. Good video. Happy Motoring.

[@ricebike]

oooh obd1 trouble code retreival is easy on the dodge/chrysler of that era. the same can be done on some obd2 models as well... key on-off-on-off-on and count the flashes for obd1🙃i should have kept my aries... one of the few back in the day with a non-interference engine. a cheap person that neglects the timing belt change interval and it snaps; no valve or engine damage

[@mostlymoparih5682]

@@ricebike yeah my belt broke and I replaced it and it fired right up. That was a great car. The brake lines started rusting away. I wish we still had our's too.

[@pootthatbak2578]

Some people even get sick and refuse the doctors advice. When you get sick or your car breaks down, its scary finding out how much its gonna hurt and/or cost😮. Some people cant cope with interruptions to their daily routine. So they try to continue on until they have a heart attack or blown engine

[@thomask4836]

I remember the days when bogging meant pulling the top off the carb, running my pinky down the fuel accelerator well to check for ridges and then just plunking in a new fuel accelerator pump if the well was smooth.

[@MitzvosGolem1]

Rochester quadradrajet 😂

[@glennfields8121]

Kenny, you cracked me up when you said "I don't know if it's the air down here in Mexico". Besides automotive maintenance, you might wish to try your hand at standup comedian. Your delivery is exceptional!

[@donames6941]

At work one day we all going home and one of the workers had a 72 ford truck it would not start the next day he ask me for help truns out he walk to the parts store and bought a battery didnt help so he bought a starter solenoid didnt help so he got a new starter didnt help so he ask me for help the next day i took a pair of pliers jump the solenoid got nothen so use my jumper cables and jump from the battery to the starter it started truns out it was the eye in the battery cable from the battery to the solenoid he said thats what he should have done i said yes

[@InsideOfMyOwnMind]

I will vouch for the weirdness of O2 sensor symptoms. My 91 Integra would hesitate for just a brief moment whenever it reached op temp then it was fine forever. But then on inspection day it failed NOX just barely but a fail is a fail. I let my guy have his way with it and within an hour he calls me and says he changed the O2 and it passed with tons of margin. It has never once hesitated since.

[@eyerollthereforeiam1709]

Old Corollas.. Not fun or exciting cars, but they run forever. I had an 03, which threw an upstream O2 sensor code. I replaced it, and the car ran a bit better, and got about 10% better fuel economy. On second thought.. That's one hot Corolla that can go from NC to Mexico that quickly! I'm not sure if an SR-71 can do it that fast!

[@82_KID]

It's the "TRD" model. With the "S" sticker 😆😆😆

[@Bseries_Vans]

I had a code p0300 p0171 amd p0174 and i emailed alot of the big named KZbin people (scanner danner eric o pine hollow etc) they all said maf sensor or it's fuel related and nothing else!!! But i put a pressure gauge on it it had 58 psi and didn't drop down or nothing stayed there...i dont have pressure regulator....its a Chevy Express 2500 ban 6.0 cant remember the maf sensor reading but they insisted....So i just did a spark plugs and wire change and that is what fixed my problem.. lol MORAL OF STORY " IF I HAD LET THEM"DIAGNOSE" my vehicle id be out of alot more than plug and wires... Thanks

[@sstrongful]

Expecting an accurate diagnosis via email or phone is silly. Throwing people under the bus for an educated opinion based on your description of the problem is also silly. That's why a shop charges a diagnostic fee. You got what you paid for... nothing.

[@Bseries_Vans]

@@bobcombs7138 that's what they told me to do lmao u want me to send you a email

[@Bseries_Vans]

@@sstrongful you want the emails lol

[@bekkiebeans6004]

Codes are just clues, sometimes they are bang on target, but sometimes it is something else causing the codes to pop. With diagnoses and then testing each individual item, will generally lay the real culprit out in the open.

[@Bseries_Vans]

@@bekkiebeans6004 that's what lead me to change plugs

[@RussellBooth1977]

We sold that same model of Toyota Corolla last year which was my mothers who inherited it off my grandmother when she died,we sold it because my mother can't drive anymore. The difference is it was right hand drive & it being an Australian built car it ran an OBD1.5 ECU meaning that while it was fitted with an OBD2 diagnostic port,it had an OBD1 compliant ECU fitted. My code reader/scanner couldn't read the data off it because it's an OBD2 only scan tool !

[@philspear73]

That secret Mexican proving ground is sure handy

[@curtw8827]

Only problem is all the Code Blue emergency stations there don't meet ADA since you can't reach them in a wheelchair. But it's Mexico. I was the engineer that specified placement of 100 stations for a local community college

[@jthonn]

That is where experience matters. Instead of a parts cannon, an O2 sensor did the trick.

[@Michael-yi4mc]

The only spot in Mexico with no palms trees or coconut trees 🌴

[@WrenchingWithKenny]

😂😂😂

[@norcal715]

The default strategy is such a great troubleshooting tool. I have repaired many issues by simply unplugging sensors, MAP, MAF O2 sensors, and temp sensors. Did it make it better or the same. Great job Kenny!

[@APOKreations_with_Kristin]

We all squirrel on the daily.. no need to apologize 😂❤

[@kmbriggs2693]

I have diagnosed vehicles that were supposedly worked on at other shops and by what I determined , the other shops had little to no diagnostic ability .

[@baldricksimson]

O2 sensors ( lambda) is a big mixture screw.

[@renj6531]

I too have seen cars with bad o2s smoke like a 5.7 oldsmobile diesel

[@Michael-yi4mc]

Cars were a lot simpler back then. Throwing the parts cannon usually worked 99% of the time. Today’s cars are much more complicated and sensitive. You’re essentially repairing a computer rather than fixing a mechanical part.

[@eppyify]

As a Newby diy-er I'm coming to realize this

[@dhgmllcshea5038]

Diagnosis is important, but my Parts Cannon is much cheaper than theirs. RockAuto rocks.

[@Michael-yi4mc]

@@dhgmllcshea5038 👍I buy my parts from both Rockauto and Amazon.

[@AT-wl9yq]

I'm not trying to insult anyone, but this is as easy as it gets. If you understand OBD2 theory, and how its applied, you would know what's wrong with the car just by reading the title of the video. The PCM is the main computer that runs the motor. It has 2 modes of operation. Open and closed loop. One of the problems you run into with modern emission is operating temperature. In order for your cats and o2 sensors to work properly, they need to be about 600 degrees. Anything less and the readings won't be correct. A car doesn't need o2 sensors to work. They're part of your emissions system. The pcm takes the readings from the o2 sensors and uses that information to set fuel trims. The only problem is, the o2 sensors won't show correct readings until they're hot. That's a problem because you would get a check engine light every time you started the car when its cold. That's where open and closed loop come in. When you first start your car, the pcm runs in open loop. Once the motor gets hot enough, it then goes into closed loop. When the vehicle is running in open loop, the pcm ignores the information it's getting from the cold o2 sensors. That's why the motor ran better when the o2 sensor was disconnected. It forced an open loop condition and bypassed the o2 sensors. That's why you weren't getting o2 readings when you were looking at the data stream on you scan tool. This is also why the car would run OK under wide open throttle. Its a safety feature. The faulty o2 sensor caused a huge lack of power. This is dangerous because you may need to step on the gas to avoid an accident, or something similar. WOT automatically bypasses the o2 sensors forcing an open loop event just like when the motor is cold. And that's what makes this such an easy diag. Given the description of the problem, there's really nothing else that it can be. This is one of the best diag procedures you have. Forcing an open loop condition bypasses the o2 sensors, and you can watch it happen in real time with your scan tool.

[@petasmith6956]

Hi Kenny great videos keep it up I myself had a similar issue with a Toyota van bogged down especially when cold no codes at all disconnected the air flow sensor it was a lot better and straight away the engine light came on so had a good look at the sensor and found a lot of dust on the wire cleaned the dust of with sensor cleaner replaced it roatested all power back to normal happy wrenching

[@AndrewMiller-vb9sx]

Very interesting had similar issue with first gen highlander ended up discovering someone had the sensor unplugged ran ok but horrid fuel mileage lol changed the sensor like different vehicle now!

[@WrenchingWithKenny]

That's great! Thanks for watching & keep wrenching 🔧

[@ricebike]

disconnecting an 02 sensor forces the computer to run open loop. just relying on the software and not on sensor feedback. should have triggered the engine light as well

[@williamhall2669]

Mexico, Texas, North Carolina??

[@SeanBZA]

South main Baptist Church, South Durham.............. Kenny has got to take a car on test under the Can Opener Bridge though.

[@bobby9195]

I'm having lunch, so Happy Happy Happy Birthday Mr Kenny 🎉😀

[@stephenharvey5932]

Look at wiring on fly by wire. I had this on 2009 tocoma . It was tat wiring damage. Had one wire not making good contact.

[@goldwingconepatterns2565]

Good to hear you are busy, busy. Are o2 sensors cleanable? Being environmentally conscious as opposed to being cheap. I realize they a little tough to get to on some cars.

[@SuckIT-2000]

Gotta love when they will never set a code for something it should, makes diagnosis a dream.

[@Michael-yi4mc]

I like that style sensor. It could be strapped down with two radiator clamps if the rusted bolts snapped off.

[@ranger178]

the problem nowadays is you replace parts, and the dealers want a ridiculous price for part and the aftermarket part half the time is crap quality or a fake so the new parts might not even work.

[@campermike8879]

Would think it run fine when stone cold and in open loop then mess up when it went to closed Thought the ECM ignored the 02 till the engine warms up

[@oldbiker9739]

my son showed up complaining no power bad gas milage , and he just pu new plugs in a 2010 GMC 1/2 ton , I checked the air cleaner filter it was plugged solid with a mouse nest 😂🤣😅

[@peterbenson3776]

Well the stealerships have a bad reputation for upselling work. Sometimes we know things that are really overdue so might as well try them anyway

[@johnbeckett2624]

I maybe wrong but I thought when you went WOT the ECU would ignore the 02 sensor and just add lot's of fuel into the engine, then when you come off the throttle a bit it would refer back to the 02 sensor and adjust the fuelling accordingly, that's what I thought was happening to this Corolla. Thanks Kenny for an interesting video.

[@legionofanon]

I believe you are right. I have a basic scanner plugged into my truck, and while driving when my rpm gets over around 1900 it switches from CL to OL. I haven't tried watching it while flooring it from a stop yet, but i imagine it does the same thing

[@dhgmllcshea5038]

86 Fiero had the O2 sensor wire cut when I got it used. Ran well but rich. Smelled like the 70s! Installed new AZone sensor and it helped the blackening of the pipes and fuel economy. That was when I first learned that the O2 sensor "breathes" thru the wire, so even a crushed or kinked wire can make the O2 fail and soldering a broken wire is a waste of time! But to your point, it ran just fine. OBD 2 = obnoxious butthead diagnostics squared! Good for the environment but bad for the owner.

[@ewconway]

I have a 2015 Toyota Camry 4 cylinder.. it has 256K miles. Never replaced the O2 sensors. No check engine light or codes. It runs good. Do you think I should replace the O2 sensors just based on the mileage?

[@baldricksimson]

why waste money ?

[@ewconway]

@@baldricksimson I tend to agree, but just wanted to pose this question

[@WrenchingWithKenny]

Nope. Let it ride 😎 thanks for watching & keep wrenching 🔧

[@ewconway]

@@WrenchingWithKenny Thank you. I figured, but wanted to ask anyways. Great channel. Keep up the good work. 👍

[@WrenchingWithKenny]

I appreciate your kind words 🔧

[@mcqueenfanman]

I always though O2 sensors didn't do much unless at a stead rpm. O2 info is like yesterdays news, it doesn't know I'm going to stomp the gas. A map/maf & tps sensors will know right away.

[@SeanBZA]

No the ECU always reads those and gets info on mixture. They just go to a default timimg pattern and ignore the sensors at wide open, as then it no longer will be driving and trying to do closed loop mixture control. Likely a lazy sensor, killed by either being filled with leaded fuel a few times, or by work done on the engine inlet or exhaust, and they used silicone sealer, which got burnt in the engine, and which does the same. Had a similar thing on my car, though the performance was not affected much, but fuel economy definitely was, by around 20%.

[@curtw8827]

Wait, the first thing the auto parts store sells is an oxygen sensor, but I guess they couldn't since the check engine light didn't come on.

[@thomasdaum1927]

Changing parts randomly to fix something is like throwing rocks in the dark , you might hit something or throw a lot of rocks !……

[@Monacomaverick]

Sounds like maybe it needed a new heated 02 sensor to get it up to temperature.

[@mikeoman7601]

I suspect you repaired the drive ability issue but that still doesn’t explain why the CEL didn’t illuminate. What do you suspect? Did you disconnect some other sensors just to see if you could trip the light?

[@baldricksimson]

because it was working within its parameters = no light.

[@mikeoman7601]

@@baldricksimson With it disconnected? Naw.

[@ricebike]

@@baldricksimson i agree with mike. 02 sensor wasnt providing feedback so computer ecu ecm should have put up the red flag. the ecu reverted to running open loop mode

[@tlak]

There's nothing wrong with throwing parts at it. If you do it yourself. You can install a lot of parts for 1-2 hrs shop cost, you learn something as you go too.

[@WrenchingWithKenny]

We have had customers spend $100s of dollars throwing parts at a car lying on the back in the driveway for a day of more chasing an issue. This customer spent $250 in parts & 2 ish days with his car in the driveway. None of the parts were needed. I don't see the return on investment there. Unless you want to tinker on your car, I guess. We have project cars for that 😎 Thanks for watching & keep wrenching 🔧

[@snowedman2993]

Blocked cat lick converter

[@neiliewheeliebin]

If they have black soot on them like that they're stuffed

[@dhgmllcshea5038]

Yes, but a chicken & egg problem... is the soot caused by constant WOT enrichment triggered by faulty O2 or was the soot the root cause?

[@neiliewheeliebin]

@dhgmllcshea5038 In my case it was blocked & leaky injectors fouling everything up, apparently this is common for direct injection

[@82_KID]

HAPPY 🎂 MR. KENNY!! FROM 82 KID AND 82 KID THE DELOREAN SUBARU 🎉 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉 🎈 🎁 🎊 🎂 🥳 🎉

[@82_KID]

Always made me laugh that Toyota sport model is TRD. Like its trying to say.. TuRD 💩

[@Michael-yi4mc]

Toyota did it again with their name blooper. The BZ4X is really the BS4U.

[@82_KID]

@@Michael-yi4mc Yeah Subaru and Toyota are romantically involved now. My 2002 Subaru Outback is Fuji Heavy Industries and says Subaru-Isuzu on one part but.. new Subarus are Toyotas. I got a 2002 Outback. One of the Last Of The Mohicans. Gen2s are probably the best of that car.. some like Gen3s some like new ones but mine is bulletproof. Gen2 "Legacy Outback.:

[@Michael-yi4mc]

@@82_KID 👍Good one!

[@82_KID]

@@Michael-yi4mc Thank you 😊 💩

[@SuckIT-2000]

Ford's were great for burning up driver modules in the ecm from faulty o2 heater circuits.

[@dickbiggerstaff5729]

I worked in parts depts for years. It's called "Parts til it starts"! LOL

[@WrenchingWithKenny]

😂😂😂 that's awesome! I haven't heard that saying before. Thanks for making me laugh & watching the channel. Keep wrenching 🔧

[@dickbiggerstaff5729]

@WrenchingWithKenny Feel free to use it, lol! I do enjoy your clips. BTW I have a 1949 Nash 600 Super 2dr Sedan with 18,9xx miles on it. Not perfect, but a really nice survivor.

[@WrenchingWithKenny]

🤯 that's awesome!!! Do you take it to car shows? It has such low mileage.

[@dickbiggerstaff5729]

@WrenchingWithKenny Not yet. It needed all new coil springs and shock absorbers, it was a terror to drive. I'm making it safe to drive and am there now so, will be making the rounds now.