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Change PCM Oxygen Sensor bad, why?

 
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spacewalker404
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PostPosted: Sat Aug 11, 2012 5:16 pm    Post subject:  Change PCM Oxygen Sensor bad, why? Reply with quote

So far this has been a consistent problem. I disconnect the battery, change to a different PCM, reconnect the battery and I have a bad oxygen sensor. Can anyone offer advice?

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Frank
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PostPosted: Sat Aug 11, 2012 6:17 pm    Post subject:   Reply with quote

Which sensor - the one on the cat? Do you have an aftermarket cat?

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IffyG
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PostPosted: Sat Aug 11, 2012 7:36 pm    Post subject:   Reply with quote

Is it possible that you have a PCM tuned for the wrong year? The oxygen sensor on the 04 and 05 Impalas look for a different signal than the 2000-2003 models.

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spacewalker404
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PostPosted: Wed Aug 15, 2012 4:46 pm    Post subject:   Reply with quote

Yeah its the aftermarket cat. But what is weird to me it that I go to Auto Zone and pick up and the same new oxygen sensor and it works fine. Eh, this car has become my junker/beater car now days anyways...

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chibiblacksheep
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PostPosted: Wed Aug 15, 2012 4:55 pm    Post subject:   Reply with quote

The first PCM probably have P0420 removed from it.

Nothing wrong with anything.

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spacewalker404
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PostPosted: Wed Aug 15, 2012 6:30 pm    Post subject:   Reply with quote

I don't believe so. The PCM I put in this time is the stock original as I'm de-modding the car. Going back a few years here but when I placed it with Overkill PCM I had to replace an oxygen sensor too. I dunno. I guess its a weird quirk about my car.

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