Home >> BMW >> 2013 >> 135is 2D Convertible, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Self Diagnosis - N55 - Diagnostic Trouble Codes - DTC P0234 (BMW DTC 120208) Through DTC P10F6 (BMW DTC 135B12) >> DTC P3012; BMW DTC 129A20: DME, internal fault, oxygen sensor before catalytic converter: oxygen-sensor module, signal-circuit adaptation values too high >> Fault code