Home >> BMW >> 2014 >> 535d >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Self Diagnosis - Diagnostic Trouble Codes (N47 & N57, Diesel) >> Fault Code Tests >> DTC P2270: BMW DTC 12AD01; DME -- O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2) >> Fault effect and breakdown warning