BMW Error Codes

System Too Lean (Bank 1) — the engine is receiving too much air or too little fuel on bank 1.

Random/Multiple Cylinder Misfire — the engine is misfiring in multiple cylinders.

Catalyst System Efficiency Below Threshold (Bank 1) — the catalytic converter is not cleaning exhaust gases effectively.

Cylinder 1 misfire detected — cylinder 1 is not firing consistently.

Camshaft position sensor A circuit malfunction — the sensor that monitors camshaft position is sending incorrect or no signal.

Small Evaporative Emission Leak — minor EVAP system leak detected.

Idle Control System Malfunction — idle speed is unstable or outside normal range.

System Voltage Low — the ECM is detecting battery/charging system voltage below the acceptable minimum.

Cylinder 2 Misfire Detected — cylinder 2 is not firing consistently.

High Speed CAN Communication Bus — the vehicle's main communication bus has a fault.

Internal Control Module Keep Alive Memory (KAM) Error — the ECM/PCM has lost its keep-alive memory.