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.