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Old 08-15-2006, 09:21 PM #1
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oxygen sensor Problem

The check engine came on and Autozone said it was the front oxygen sensor. I replaced that and reset the check engine by unhooking the battery. I ran very bad at first then got better. Later the check engine came on. I reset it again.. it happened again. took it back to the Zone they said it was the same sensor. Replaced it again and the exact same thing happened again.
At a loss. Any help would be appreciated. 99 4runner
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Old 08-15-2006, 10:23 PM #2
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What was the code? it could be any # of things not just O2 sensor.

What engine/miles.



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Old 08-16-2006, 12:22 PM #3
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Remove the MAF and spray it with electrical cleaner. And yes ... always proved adequate vehicle info
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Old 08-16-2006, 08:41 PM #4
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Sorry about the Code. My wife went to A-zone today and they checked it and said it was not the O2 and said that the #1 injector was lean. She said the Code was PO 701 or something close with 7,0,1 in it. The sold us some Sea Foam to put in the tank. Is this good Info??
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Old 08-17-2006, 09:51 AM #5
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The exact code number is important however, a PO171 is difficult to diagnose as it can be either a drifting O2 sensor or a dirty MAF. The MAF and O2 sensors work together. It is best to remove the MAF and clean it by spraying it with electrical cleaner. If the code goes away then you are golden. If it does not then you most likely need a new O2 sensor.
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Old 08-17-2006, 08:34 PM #6
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What do i need spray. I am guessing it is right behind the air filter. Do i need to take that section off?
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Old 08-17-2006, 08:48 PM #7
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go here:
http://www.4x4wire.com/toyota/mainte...tenancep5.html
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Old 08-17-2006, 10:59 PM #8
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Clean the maf sensor for starters. A P0171 is a system too lean code. Cleaning the maf 9 times out of 10 fixes this. You may want to check the sensor you replaced and make sure you got the right one. Go to the dealer and ask the parts department to give you the part # for the air fuel sensor 1. This is the sensor that advance is calling a 02 sensor. Check the #'s and confirm it is the same. The wrong sensor will throw a check engine light. We see this all the time at the dealership when people go to autozone or advance auto for a diagnosis.
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Old 08-22-2006, 08:48 PM #9
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Cleaned MAF -problem solved. THANKS ALL!!!
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Old 11-05-2016, 12:55 PM #10
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2003 Toyota 4runner, o2 sensor engine light

post - 9/29/2016
2003 Toyota 4 runner, limited. purchased new, engine warning light, VSC track off light is on stays on, even when you disconnect battery or, replace fuel cap, read on!
Engine warning light VSC track off light is on. Serviced on 9/23/2013, 103,000 miles - $422.81 replaced 1 sensor bank 1, 1 hr labor. No codes provided possible replacement of Catalytic convertor in the future is noted? 3000 miles outside of emission warranty of 100,000 miles.
Repeat service , again – requested service for engine warning light VSC track off light is on. Serviced on 6/19/14, 104563 miles $366.72, replaced bank 2 sensor 1.50 hr labor. Dealer states they only replaced one sensor prior. No codes provided
Again - Requested service for engine warning light VSC track off light is on. Serviced on 8/15/2015, 117911 miles, dealer requests to replaced both bank1 & bank 2 sensors? I called Toyota. Toyota notifies dealer of recall / parts revision, to replace prior factory installed sensors, to follow Bulletin number - 1gr-fv-v6, dated 2/11/2005. Dealer never realized they had a revision on factory installed O2 sensors but does comply ; dealer refuses to honor their mistake of not following factory directive to replace sensors with new part numbers, charges me additional $235.71 (labor only). No codes provided. Dealer refuses to work with me.
Again - Requested service for engine warning light VSC track off light is on. Sept. 22, 2016, 124549 miles. This time dealer states oil is fowling sensor near fire wall / rear O2 sensor causing error reading (causing engine / VSC lights). Dealer reports code reading - p0136, case number created. This is my 4th time with this problem over a period of 3 years.
I called Toyota factory again explaining that Dealer is having problems servicing my car; dealer’s contention is that it’s a different problem. Dealer has my 4 runner for 2 days now, never calls me back. When I did reach dealer they explained that Toyota factory has been called with engineer’s conclusion which is: Transmission oils are fowling o2 sensor; oil from transmission and engine are traveling up “cabling” to CPU module causing sensor warning and error reading at CPU. At this time dealer explains that they have spoken to factory and agrees to follow factory advice, quotes me cost to repair - $2600.00, computer module is additional. Asked for a rental car and signs me out with rental. 35.00 per day.
Replacement Parts would include - transmission & engine harnesses, transmission fluid , gasket sealant, 12 hours of labor, total paid to dealer $2436.73. Dealer credits me my 4 day rental car. They went by the book!

I asked dealer if I could see old parts and dealer complied. Over looking old parts I witnessed oil infusion on all Molex plugs and harnesses… oil noted inside male plugs that could cause arcing, failure or even fire. I was shown removed transmission harness and plug that runs inside transmission body. Took photos of old cabling with oils showing up inside plugs etc. Had to be at least 10-15 feet of cabling / parts.
On Oct. 16, 2016 after, while my check was not even cashed / still warm, only booked 60 miles since the repair, errors codes appear again, engine, VSC lights appeared once again, had to bring it back to dealer. Waited 2.5 days, dealer replaced rear engine o2 sensor, stating that it could have been damaged by all the work that was done!
Conclusion, 11/5/2015, it appears to be working, I have my doubts, my fingers crossed.
Note: that it is fixedo2 sensor are federally required pollution devices. My problems started at 103,000 miles just outside the 100,000 emission warranty. Factory refuses to recognize this point or make good!

Purchased vehicle new, never had a major problem. My experience with dealer, I feel that I have been wronged here. Dealer and manufacture do not understand that they lost my respect when they did not follow Bulletin 1gr-fv-v6, dated 2/11/2005 or work with me just outside the factory warranty on originally serviced date 9/23/2013 (car being only10 years old), 103,000 miles and dealer did not honor parts and labor warranties. It’s going to be a long time before I forget this experience. Manufacture and dealer should consider, If fluids are traveling up and down cabling into electrical systems, If my assumptions are correct, knowing transmission fluid can act as a combustible “at the right temperature” it’s just a matter of time for fatality or disaster to happen. You might look at this “as not your problem” but as a retired mechanical engineer I see this as a major problem which should be addressed. The factory customer services should be held accountable for doing their jobs of reporting these concerns promptly, think out of the box with addressing complaints. Copy of this letter has been sent to better business and state general’s office for consideration and filing.
Do it yourself? - How to Fix a Bad O2 Sensor - Toyota Parts Blog
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Old 09-18-2021, 09:02 PM #11
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OK, so this is an old subject but my search-fu has failed me and I have questions.

Couple of weeks ago I got the check engine light with the traction control lights on and a P0031 code, bank 1 sensor 1 failure.
Changed the sensor, changed the gas cap, car worked fine for about an hour or so, then got the same s*it again.

What could be the problem? Catalytic converter went bad? Manifold leak? What do you smart people say, what else could be the problem?

Thanks!
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Old 09-18-2021, 09:46 PM #12
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Originally Posted by plutonic View Post
OK, so this is an old subject but my search-fu has failed me and I have questions.

Couple of weeks ago I got the check engine light with the traction control lights on and a P0031 code, bank 1 sensor 1 failure.
Changed the sensor, changed the gas cap, car worked fine for about an hour or so, then got the same s*it again.

What could be the problem? Catalytic converter went bad? Manifold leak? What do you smart people say, what else could be the problem?

Thanks!
p0031 is upstream o2 sensor a/f. Did you replace it with denso or orm. if you have access to obd scan then check the bank one sensor one values. It will cycle from 0.01v to 0.09v volts when heated up to operating temp rapidly.
What Gen 4runner?
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Old 09-19-2021, 11:43 AM #13
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Quote:
Originally Posted by spartacus View Post
p0031 is upstream o2 sensor a/f. Did you replace it with denso or orm. if you have access to obd scan then check the bank one sensor one values. It will cycle from 0.01v to 0.09v volts when heated up to operating temp rapidly.
What Gen 4runner?
I replaced it with a Denso sensor, 4th Gen 2004 V8.
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