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Discussion Starter #1 (Edited)
Currently driving a 2008 528i with roughly 165k miles.

My engine light comes on while highway driving and goes off randomly code 2C31 - (thread title is wrong). Been doing this for 3 months now. Occasional trouble starting but just delayed like a half/quarter second longer when pushing the start button. Idle fluctuates 200-300 while in drive but not moving but seems fairly normal and is not erratic IMO.

New: Plugs, Coil Packs, Pre-Cat O2 sensor (cyl 1-3), oil filter housing gasket

This thing is driving me nuts going on and off. Any ideas besides a smoke test and replacing CCV Valve? Thanks!
 

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2006 530xi 6 MT
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I'd replace #4 now. I haven't had this problem myself, but some Google searches show that people with 2C31 that doesn't stay gone then changed the post-cat sensor and had success after that. And, since you bought it already, just change it.
 

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Discussion Starter #8 (Edited)
Replaced the bank 1 sensor 2 post cat sensor (#4 in diagram) and manually reset the check engine light. 1k miles so far and it hasn't come back on yet.
 
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