JByrne23

Hey guys! I have an 09 c-63 and had the CEL come on with " O2 sensor pumping problem"
Bank 1 , sensor 2 . Has anyone ever gotten this code? And which side is bank 1 , so I can start with at least changing the sensor? Thanks again for all the usefull info on this site! Keep up the good work!

JB

BerBer63

passenger side, sensor 2 likely one most distal from engine (after primary cat)

JByrne23

Thanks for the response! Have you ever seen this code? And where can I find the fuses for the O2 sensors just so I can rule that out?

Merc63

There is fuses in the trunk and the front under the hood.

Doubt its a fuse.


Probably need a new sensor. Don't go to the dealer, order online.