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Discussion Starter #1
I have a 99 SE and the check engine light is on. I checked the codes and I get three of them.

0707 - Downstream oxygen sensor or circuit fault
0510 - Downstream oxygen sensor maximum voltage monitor fault
0512 - Downstream oxygen sensor high voltage fault

I've reset the computer a few times and the codes will clear for a few weeks of driving, but will eventually come back. Do these codes actually mean that I have a bad downstream oxygen sensor or do I have something else? Could it be something with the catalytic converter? I checked the gas's on tight.
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