DTC P3027, BMW Hex Code 0x2CA1, BMW Code 11425: O2 Sensor Operating Temperature Not Reached (Bank 2 Sensor 1) (MAX): Subcomponent

Monitoring of sensor ceramic temperature and control signal pulse-duty factor detects reduced heater performance at oxygen sensor before cat. (no defect in heater wiring) Diagnosis conditions: - No overrun cutoff - Exhaust-gas temperature > 400°C - No other O2 sensor faults