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      06-12-2012, 07:45 PM   #1
JohnnyRoaster's Avatar
Drives: 09 Jerez Black M3 Sedan
Join Date: Nov 2008
Location: Outside Beantown

Posts: 942
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Increased Emissions

I have just under 29,000 miles on my 2009 sedan. i got an increased emissions, service engine soon message on my idrive today. The car drives fine and no reduced power message. The code is P2629O2 Sensor Pumping Current Trim Circuit/Open Bank 2 Sensor 1.

My question is should I just reset the code and see if it comes back or take it in to the dealer and not clear the code. I have a cat back exhaust but no other mods. Could this issue be caused by a bolt on cat back exhaust? I am sure the dealer will blame the problem on the aftermarket exhaust.
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