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Old 09-18-2021, 09:46 PM
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spartacus spartacus is offline
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Quote:
Originally Posted by plutonic View Post
OK, so this is an old subject but my search-fu has failed me and I have questions.

Couple of weeks ago I got the check engine light with the traction control lights on and a P0031 code, bank 1 sensor 1 failure.
Changed the sensor, changed the gas cap, car worked fine for about an hour or so, then got the same s*it again.

What could be the problem? Catalytic converter went bad? Manifold leak? What do you smart people say, what else could be the problem?

Thanks!
p0031 is upstream o2 sensor a/f. Did you replace it with denso or orm. if you have access to obd scan then check the bank one sensor one values. It will cycle from 0.01v to 0.09v volts when heated up to operating temp rapidly.
What Gen 4runner?
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