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Discussion Starter · #1 ·
Hi Volvospeed,

I have a persistent message that caused me to replace the rear o2 sensor (downstream post-cat) twice with new sensors (one cheap & one Bosch) with the same error. I am thinking there is a short in the wiring or fuse or something that is causing the to throw the code. Has anyone had this issue or similar with the 02 sensor wiring? . I am looking at it in VIDA and the recommendations are somewhat vague, I'd prefer if someone would respond who had some experience in this particular issue.

I took a live snapshot of the engine where one can see that the post-cat sensor is below (and yes consistently below <0.400).


Thank you for any advice.
 

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Discussion Starter · #2 ·
FYI - After dealing with this for 6 months and many parts replaced, the issue was the catalytic converter(cc). Since the cc is around $2500 for california specific cc, I circumvented with an o2 extender on the third or rear o2 sensor.
 
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