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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 P0133, BMW Hex Code 0x128901, BMW Code 1214721: O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) >> Possible Fault Causes

Possible Fault Causes

-Oxygen sensor before catalytic converter defective

-Oxygen sensor behind catalytic converter defective

-Defect in wiring harness to oxygen sensor behind catalytic converter

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