P0139..Just the o2 sensor or warning of cat going out?
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I'm getting a 'pending fault' of 'O2 Sensor Circuit Slow Response' (B1S1) and I'm concerned that it could be a warning sign of the catalytic converter going out. Reason I say this is because this CEL code appeared immediately after I replaced the upstream sensor (P0135 'O2 Sensor Heater Circuit' code popped up). It usually goes away after a few days but will pop up randomly mostly at any sign of "aggressive" driving (e.g.- 4k+ RPMS
).
So is it just a coincidence that the secondary sensor has gone out right after the primary or could I possibly have some other issues going on?
Thanks
![](https://www.s2ki.com/s2000/public/style_emoticons/default/rolleyes.gif)
So is it just a coincidence that the secondary sensor has gone out right after the primary or could I possibly have some other issues going on?
Thanks
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