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Thread: 97 TJ O2 sensor

  1. #1
    Junior Member
    Join Date
    Aug 2011
    Posts
    5

    97 TJ O2 sensor

    I have a 97 TJ 4 cyl with a 1,500 miles on a recently re-built engine. It was running great until I got CEL code P0132 O2 circuit high voltage bank 1 sensor 1. Lots of sputtering backfire lack of power. I replaced the upstream O2 sensor with a new Bosch sensor and reset/ cleared the engine codes with a scan tool.

    Ran the jeep for a couple of miles and same symptoms, and CEL code.

    I believe the O2 sensors compare the pre and post cat converter voltages to adjust fuel injection (thus the lack of power, backfire).

    Here is the question: Does the pre cat O2 sensor compare the voltage to a predetermined number or does it compare it to the post cat sensor? In other words could a bad post cat sensor give me an error code for the front sensor? What else might cause this?

    The engine idles fine and I can't detect any exhaust or intake leaks

  2. #2
    Junior Member
    Join Date
    Aug 2011
    Posts
    5
    You might have just got a bad sensor, I run a Bosch, but honestly haven't heard many good things about them. IIRC the downstream (after cat) sensor won't really cause your vehicle to run significantly different.


 

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