Home >> BMW >> 2014 >> 650i 2D Convertible >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Self Diagnosis - Diagnostic Trouble Codes - Bank 1 (N63TU) >> Fault Code Tests >> DTC P2198: BMW DTC 128401; DME -- O2 Sensor Signal Biased/Stuck Rich (Bank 2 Sensor 1) >> Fault effect and breakdown warning