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Discussion Starter · #1 ·
I’ve had multiple circumstances where my CEL would come off and on and it would throw the code p0139
It would stay in maybe for a day or two and go away and do so for a while until recently it just stayed in for a good month
I thought it’d go away as usual but it hasn’t
Should I change my down stream sensor or up stream?? Or could it be something else causing it?
 

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That code is for the downstream sensor. It's specific to the sensor itself, so not caused by poor fuel/air control or a bad cat.

Inspect the wires and the connector first, if no obvious problems then I'd just replace the sensor.
 
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