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 P2243, BMW DTC 128E01: Oxygen sensor before catalytic converter, line fault: open circuit, Nernst line >> Fault code