Home >> BMW >> 2014 >> 750Li >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Self Diagnosis - Diagnostic Trouble Codes - Bank 2 (N63TU) >> Fault Code Tests >> DTC P2240: BMW DTC 12BD54; DME -- O2 Sensor Positive Current Control Circuit/Open (Bank 2 Sensor 1) >> Fault effect and breakdown warning