P0139

Hey guys, the Pu lit up with p0139 last week (Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)) and after clearing it, it came back today. I've researched it and from what I've seen, it's got to do with the O2 sensor not being far into the DP enough to get a proper reading or an exhaust leak. I've had my DP on (UR v2) for 30K miles without any issues, so I'm not sure that's the issue. I wasn't able to identify any exhaust leaks, either. I pulled a log (attached) and didn't notice anything out of the ordinary. Is it possible that the sensor's just gone bad? I haven't felt any poor performance or anything else as a result of the code. Car has all the usual bolt ons + grx2867r.

Thoughts?

Thanks.

 

could also just be your O2 going bad, but the AFR in the log looks fine. Check your connections first I guess then see if it comes back.

 

Sorry to bump this thread, but did you ever figure out what it was? I've got a UR TBE and it's been on 60k miles. Just the past month I've had P0139 show up multiple times and my AFR is fine as well.

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