Just to amplify... BANK 1 on a Mercedes engine (V6/V8/V12) is the RIGHT side (passenger) USA version.

ALSO fuel trim codes rarely suggest O2 sensor problems but instead mean that the computer has gone to an adjustment level that can't be changed by O2 sensor inputs.

There are also 10-20 O2 codes that start with P1 instead of P0 & those codes vary from car to car/ fuel system to fuel system.

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