Question about 1996 Toyota Tacoma

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O2 Sensors I have a 1996 tacoma and the engine light came on. I took it to auto zone and they hooked it to the computer and said I had a bad oxygen sensor.(bank 1 Sensor 2) I bought the sensor and replaced it, then I removed the positive cable from the battery to reset the code.(I was told this is how to reset the computer) The next day the light comes on again. Is it possible that another sensor is bad? I was told that the computers may not be that accurate ( they could read a sensor was bad but couldn't tell which one). So I went ahead and replaced out the sensor located downstream of the converter(bank1 sensor3) with the used sensor I removed from bank1 sensor 2 and disconnected the battery. The next day the engine light comes on. I took it back to auto zone and it is still giveing the origional code. bad sensor (bank 1 sensor 2 - The one I replaced with a new sensor). I am told that there are 4 sensors on this truck, but I could only see the 2 around the catalytic converter. Any Ideas on where to go from here? Thanks

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  • keving772003 Dec 30, 2008

    Thanks. The sensor I used was a bosch and costs about $100.00. I do have a question though. After I replaced the” bad” sensor with the bosch and placed the “bad” sensor after the converter why am I still getting a code for just the bosch sensor and no the “bad” sensor in a new location?

    Is it possible for the computer to read the bad sensor but not have the exact location of it? Also, is it possible to have a wiring problem and the sensors are ok, or would that be another code? I am just trying to figure this out in my head before I go out and buy another Toyota sensor.

    Thanks Again.

  • keving772003 Dec 30, 2008

    I have the v6 so I have the bank 2 sensor 2, this is where I placed the "bad" sensor, and still only get the code for the bank 2 sensor 1. Should I get a code for this location if the sensor is really bad?

  • keving772003 Dec 30, 2008

    So, from what you have heard so far, do you think I should start with the fuel injection cleaner, or buy another sensor?

  • Anonymous Jan 14, 2009

    Hi, Again

    I had taken your advice and tried the BG-44K, I also got another new sensor and tried it out, but I continue to get the bank 1 sensor 2 code. I have calculated the gas mileage and I am losing about 5 mpg. I think I have done all I can. Do you have any other ideas?




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Autozone oxygen sensors do not function properly in Toyota vehicles. Just had a Tacoma yesterday with the same issue. New sensors, runs poor, check engine light on. Toyota sensors fixed it right now.

Posted on Dec 30, 2008

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  • Toyota Ed Dec 30, 2008

    The "Air-Fuel" sensors are bank one, sensor one, and bank two sensor one. The "Oxygen Sensor(s)" are Bank one, sensor two, and, for a V-6, Bank two, sensor two. The Air-Fuel and the Oxygen sensors are markedly different, they do not interchange. The difference of the Bosch vs "factory" is the millivolt reading produced by the sensors; the Bosch ones do not provide sufficient voltage to the ECU.

    The graciousness of a FixYa rating for my assistance would be greatly appreciated.

  • Toyota Ed Dec 30, 2008

    That depends. If the front one's value is incorrect, the computer will see that first. Understand that they work together to acheive optimum performance. Additionally, with bad any sensors, the cat may be "sooted up", I would def suggest some real good fuel injection cleaner to clean it out, "BG-44K", if you can find it, is the BEST.

  • Toyota Ed Dec 30, 2008

    Def the cleaner before buying sensors. No question.



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