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P0420 code, replaced front o2 sensor, no cats = what else could it be???

This is a discussion on P0420 code, replaced front o2 sensor, no cats = what else could it be??? within the General Help forums, part of the LSx Technical Help Section category; I have a 02 trans am that keeps throwing a P0420 code at me even after ive cleared it several ...

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    Junior Member FLEX3269's Avatar
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    Question P0420 code, replaced front o2 sensor, no cats = what else could it be???

    I have a 02 trans am that keeps throwing a P0420 code at me even after ive cleared it several times. I have no cats, i have an ory, and i just replaced the front o2 sensor the other day, i have a diablo tuner that is supposed to turn off the rear o2 when i installed the tune. So i have no idea what could be wrong?? If anyone has any ideas i would love to hear them.

    Thanks, Tony

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    Veteran 0rion's Avatar
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    that's a drivers side rear O2 sensor code. Evidently you don't have them turned off with diablo. I forget how the diablo's screen was set up. Are there different options or just on and off? I would hook back up and make sure you're turning those off.

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    Junior Member FLEX3269's Avatar
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    Well honestly i cant find that specific code in my tuner to turn it off and on diablo just says that it gets turned off with their tune

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    Veteran 0rion's Avatar
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    I'm pretty sure you have to go into the "modify parameters" section and turn the codes off there. Let me do some searching real quick.

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    ok, looks like you have to go into modify parameters and turn off COT to disable that code.

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