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      11-29-2012, 08:21 PM   #4
orionredwing
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Drives: 335i Sedan, 135i Coupe
Join Date: Dec 2006
Location: San Jose

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2007 335i  [5.00]
O2 sensor, bank 2, the one behind the catalytic converter, just as your BT tool said.

Got mine swapped out 2 yrs ago. Love the BT tool

There are 4 O2 sensors total (2 pre, 2 post catalytic converter). My mechanic didn't know which one was bank 1 or 2, so I had both swapped out, which fixed the problem. Labor's expensive in NorCal, and I didn't have time to consult my Bentley manual (since this was my only car at the time).
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