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Toyota tundra oxygen sensor

Replaced oxygen sensor on 2001 toyota tundra. check engine light is still on. will not go out was bank one sensor. only 2 on truck this is an automatic v6 sr5 model

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  • Cars & Trucks Master
  • 1,975 Answers

Just because you get a diagnostic trouble code (DTC) saying something to the fact of the heated oxygen sensor, it doesn't always mean that it is the sensor itself. I am guessing you cleared the code and it is returning with the same DTC. If you haven't you have to clear the DTC. As I was saying your computer detcts manying different things in the oxygen sensor circuit but other things could cause a DTC. I'm guessing that the DTC you have been getting is in the P0130's (130, 133, 134 and so on). There are a few tests in order to determain the cause. Say your computer is detcting a lean burning condition in the O2 sensor circuit. That could mean a leak in the exhaust or a vacuum leak. A rich burning condition means that you're computer is detecting to much fuel getting into the exhaust which could be a faulty injector. You could have an open circuit in the wiring from the O2 sensor to the computer or even a faulty ground. this is where diagnosing so so important and being in the business I get upset with these auto parts stores that pull DTC's for free and then tell you it's a sensor or something and people purchase the sensor without fully diagnosing the problem and just end up replacing the sensor. Not only have they waisted money for a not needed part, they cannot even return it due to the fact it's an electrical item even though one of thier sales clerks have told them that's the problem. Not sure if this is the case for you but I hope you get the idea. If you can get me the DTC I'll be happy to help you try and diagnose the problem. You can reply/comment back here or feel free to email me at csautomotivecars@att.net.

Posted on Jul 14, 2013

Testimonial: "thank you so much. I went to get the light turned off and code cleared. they will not reset the code. I have checked all vacume lines, evaporator canister and checked the manifold for any leaks. had this problem last month. they tested it, said it was o2 sensor bank one sensor 1. light went out 2 days later all by itself. now it has come back on. went and checked for codes. same thing bank one sensor 1. ordered denso sensor 125.00 ouch. truck runs fine, no odor, or rich exhaust smell. have to try to get light reset to see if it reappears.... was told it would reset after running the truck for 20 minn or so. "

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Posted on Jan 02, 2017

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chuckster57
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SOURCE: check engine light on my

Bank 2 will be the side that DOESN'T have the #1 Cylinder..Sensor 1 will be the one BEFORE the catalyitic convertor. On your car if it is a V6 then Bank 2 is the DRIVERS side, and if it's a V8 then Bank 2 is the PASSENGER side.

Posted on Jul 09, 2011

ZJLimited
  • 17970 Answers

SOURCE: bank 1 lower oxygen sensor - replaced with mopar sensor check engine light still on

Hi Larry:
DTC P0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)
The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.

A code P0138 may mean that one or more of the following has happened:
Faulty O2 sensor
Short to battery voltage in O2 sensor signal circuit
High fuel pressure (not as likely)

Here are some potential solutions:
Replace O2 sensor
Repair short to battery voltage in o2 sensor signal circuit

Check it; hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Mar 01, 2012

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Bank 1 is always the sameside of the engine as the number one cylinder.
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Cylinder number 1 on this engine is on the drivers side. So bank 2 is the passenger side of the engine and sensor 1 will be located before the catalytic converter.

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Bank 2 will be the side that DOESN'T have the #1 Cylinder..Sensor 1 will be the one BEFORE the catalyitic convertor. On your car if it is a V6 then Bank 2 is the DRIVERS side, and if it's a V8 then Bank 2 is the PASSENGER side.

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On my '02 tundra the oxygen sensor(bank1 sensor 1) needs replacing. is it difficult, and what does it look like. my understanding is that it is licated underneath near exhaust.


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Check Engine light is on


I would recommend that you change all oxygen sensors at the same time. A little expensive but it will save you the the aggravation of changing one at a time. Get it all done at once. anyhow the bank 2 sensor 2 is the Right side manifold second sensor the one closes to the catalytic converter. good luck. thanks for using FIX YA

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