Home >> BMW >> 2010 >> 760Li >> Repair and Diagnosis >> Engine Performance >> System >> Self Diagnosis - N74 - Diagnostic Trouble Codes - DTC P10C4 (BMW DTC 11B201) Through DTC P12D6 (BMW DTC 12CE01) >> DTC P305D; BMW DTC 12B502: Oxygen sensor heating before catalytic converter, function: Operating temperature not reached during warm-up >> Fault code