P0412 means Secondary Air Injection System Switching Valve A Circuit Malfunction. The DME records it when DME cannot electrically operate the switching valve; diagnosis must separate an electrical signal fault from a real system fault.
P0411 means Secondary Air Injection System Incorrect Flow Detected. The DME records it when lambda response does not confirm the commanded cold-start airflow; diagnosis must separate an electrical signal fault from a real system fault.
P0365 means Camshaft Position Sensor B Circuit Bank 1. The DME records it when exhaust-cam position signal is missing or implausible; diagnosis must separate an electrical signal fault from a real system fault.
P0335 means Crankshaft Position Sensor A Circuit Malfunction. The DME records it when engine-speed signal is missing or implausible; diagnosis must separate an electrical signal fault from a real system fault.
P0325 means Knock Sensor 1 Circuit Malfunction Bank 1. The DME records it when DME cannot trust the combustion-knock signal; diagnosis must separate an electrical signal fault from a real system fault.
P0243 means Turbocharger Wastegate Solenoid A Malfunction. The DME records it when DME detects an electrical or functional solenoid fault; diagnosis must separate an electrical signal fault from a real system fault.
P0234 means Turbocharger/Supercharger Overboost Condition. The DME records it when actual MAP exceeds requested boost; diagnosis must separate an electrical signal fault from a real system fault.
P0191 means Fuel Rail Pressure Sensor Circuit Range/Performance. The DME records it when measured rail pressure is implausible relative to commanded pressure; diagnosis must separate an electrical signal fault from a real system fault.
P0155 means O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1. The DME records it when heater current or warm-up behavior is implausible; diagnosis must separate an electrical signal fault from a real system fault.
P0150 means O2 Sensor Circuit Malfunction Bank 2 Sensor 1. The DME records it when DME sees an invalid mixture signal on bank 2; diagnosis must separate an electrical signal fault from a real system fault.
P0135 means O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1. The DME records it when heater current or warm-up behavior is implausible; diagnosis must separate an electrical signal fault from a real system fault.
P0133 means O2 Sensor Circuit Slow Response Bank 1 Sensor 1. The DME records it when lambda response is slower than expected during mixture changes; diagnosis must separate an electrical signal fault from a real system fault.