Home >> BMW >> 2014 >> 535d >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Self Diagnosis - Diagnostic Trouble Codes (N47 & N57, Diesel) >> Fault Code Tests >> DTC P2237: BMW DTC 12BD52; DME -- O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 1) >> Fault effect and breakdown warning