- P0400Exhaust Gas Recirculation Flow MalfunctionFull content
- P0401Exhaust Gas Recirculation Flow Insufficient DetectedFull content
- P0402Exhaust Gas Recirculation Flow Excessive DetectedFull content
- P0403Exhaust Gas Recirculation Circuit MalfunctionFull content
- P0404Exhaust Gas Recirculation Circuit Range/PerformanceFull content
- P0405Exhaust Gas Recirculation Sensor A Circuit LowFull content
- P0406Exhaust Gas Recirculation Sensor A Circuit HighFull content
- P0407Exhaust Gas Recirculation Sensor B Circuit LowFull content
- P0408Exhaust Gas Recirculation Sensor B Circuit HighFull content
- P0409Exhaust Gas Recirculation Sensor A CircuitFull content
- P040AGas Recirculation Temperature SensorACircuitFull content
- P040BGas Recirculation Temperature SensorACircuit Range/PerformanceFull content
- P040CEGR Temperature Sensor A Circuit LowFull content
- P040DGas Recirculation Temperature SensorACircuit HighFull content
- P040EEGR Temperature Sensor A Circuit Intermittent/ErraticFull content
- P040FGas Recirculation Temperature SensorA / BCorrelationFull content
- P0410Secondary Air Injection System MalfunctionFull content
- P0411Secondary Air Injection System Incorrect Flow DetectedFull content
- P0412Secondary Air Injection System Switching Valve A Circuit MalfunctionFull content
- P0413Secondary Air Injection System Switching Valve A Circuit OpenFull content
- P0414Secondary Air Injection System Switching Valve A Circuit ShortedFull content
- P0415Secondary Air Injection System Switching Valve B Circuit MalfunctionFull content
- P0416Secondary Air Injection System Switching Valve B Circuit OpenFull content
- P0417Secondary Air Injection System Switching Valve B Circuit ShortedFull content
- P0418Secondary Air Injection System Relay A Circuit MalfunctionFull content
- P0419Secondary Air Injection System Relay B Circuit MalfunctionFull content
- P041AGas Recirculation Temperature SensorBCircuitFull content
- P041BGas Recirculation Temperature SensorBCircuit Range/PerformanceFull content
- P041CGas Recirculation Temperature SensorBCircuit LowFull content
- P041DGas Recirculation Temperature SensorBCircuit HighFull content
- P041EGas Recirculation Temperature SensorBCircuit Intermittent/ErraticFull content
- P041FAIR System Switching Valve A Circuit LowFull content
- P0420Catalyst System Efficiency Below Threshold (Bank 1)Full content
- P0421Warm Up Catalyst Efficiency Below Threshold (Bank 1)Full content
- P0422Main Catalyst Efficiency Below Threshold (Bank 1)Full content
- P0423Heated Catalyst Efficiency Below Threshold (Bank 1)Full content
- P0424Heated Catalyst Temperature Below Threshold (Bank 1)Full content
- P0425Catalyst Temperature Sensor (Bank 1 Sensor 1)Full content
- P0426Heated Catalyst Temperature Below Threshold (Bank 1)Full content
- P0427Catalyst Temperature Sensor Range/Performance (Bank 1)Full content
- P0428Catalyst Temperature Sensor Low Input (Bank 1)Full content
- P0429Catalyst Heater Control Circuit (Bank 1)Full content
- P042ACatalyst Temperature Sensor Circuit Bank 1 Sensor 2Full content
- P042BCatalyst Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2Full content
- P042CCatalyst Temperature Sensor Circuit Low Bank 1 Sensor 2Full content
- P042DCatalyst Temperature Sensor Circuit High Bank 1 Sensor 2Full content
- P042EGas RecirculationAControl Stuck OpenFull content
- P042FEGR A Control Stuck ClosedFull content
- P0430Catalyst System Efficiency Below Threshold (Bank 2)Full content
- P0431Warm Up Catalyst Efficiency Below Threshold (Bank 2)Full content
- P0432Main Catalyst Efficiency Below Threshold (Bank 2)Full content
- P0433Heated Catalyst Efficiency Below Threshold (Bank 2)Full content
- P0434Heated Catalyst Temperature Below Threshold (Bank 2)Full content
- P0435Catalyst Temperature Sensor (Bank 2 Sensor 1)Full content
- P0436Heated Catalyst Temperature Below Threshold (Bank 2)Full content
- P0437Catalyst Temperature Sensor Range/Performance (Bank 2)Full content
- P0438Catalyst Temperature Sensor Low Input (Bank 2)Full content
- P0439Catalyst Heater Control Circuit (Bank 2)Full content
- P043ACatalyst Temperature Sensor Circuit Bank 2 Sensor 2Full content
- P043BCatalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2Full content
Other systems
This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.