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Well, unfortunately the two original codes came back, 2C31 and 2C2C. At least I can conclude its not a bad sensor, since I swapped them from bank to bank and bank 2 still triggers an out of range lambda condition.
I ran a short log of sensor data with Bimmerlink, everything seems even between the two banks, but bank 2 lambda values are lower across the board. Off throttle bank 1 lambda lingers around .95 and bank 2 lambda lingers around .85 - not sure if that means leaner or richer condition.
I've just replaced all the spark plugs and coils, as well as the CCV tubes. I double checked all my work, all connections are solid, no leaks. No misfires. Not sure what the next step should be. Injectors would probably cause a misfire. Tiny vacuum leak somewhere perhaps?
I am thinking of swapping the MAF sensors from side to side as well, but according to bimmerlink the airflow is dead even across the two banks, so that's unlikely to provide a result.
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