Home >> BMW >> 2010 >> 550i Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Self Diagnosis - Diagnostic Trouble Codes - DTC P0035 - DTC P0480 (N63 & S63) >> Diagnostic Trouble Codes (DTCS) MSD85 - Bn2020 >> DTC P2270, BMW Hex Code 0x12A102, BMW Code 1220866: O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) >> Fault Code (hex)