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Home >> BMW >> 2012 >> X6 50i >> Repair and Diagnosis >> External Pages >> Different car >> Section 1998 (Self Diagnosis - Diagnostic Trouble Codes - DTC P0035 - DTC P0480 (N63 & S63)) >> Diagnostic Trouble Codes (DTCS) MSD85 - Bn2020 >> DTC P0040, BMW Hex Code 0x128008, BMW Code 1212424: O2 Sensor Signals Swapped Bank 1 Sensor 1 / Bank 2 Sensor 1 >> Monitoring criteria

Monitoring criteria

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The fault is recognized when the lambda controller on one bank is above 25 % and simultaneously below -25 % on the other bank.

Potential problem source(s):

-Oxygen sensors before catalytic converter