Home >> BMW >> 2011 >> X6 ActiveHybrid >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Diagnostic Trouble Codes (ACTIVEHYBRID) - DTC P0040, BMW DTC 128008 Through DTC P300F, BMW DTC 138904 >> DTC P305D, BMW DTC 12B502: Oxygen sensor heating before catalytic converter, function: Operating temperature not reached during warm-up >> Fault code