P400 - P499 OBD II Diagnostic Codes

PO400 - PO499 Numbered Code Identification Chart

P0400  Exhaust Gas Recirculation Flow Malfunction  P0401 Exhaust Gas Recirculation Flow Insufficient Detected  P0402 Exhaust Gas Recirculation Flow Excessive Detected  P0403 Exhaust Gas Recirculation Circuit Malfunction  P0404 Exhaust Gas Recirculation Circuit Range/Performance  P0405 Exhaust Gas Recirculation Sensor A Circuit Low  P0406 Exhaust Gas Recirculation Sensor A Circuit High  P0407 Exhaust Gas Recirculation Sensor B Circuit Low  P0408 Exhaust Gas Recirculation Sensor B Circuit High  P0410 Secondary Air Injection System Malfunction  P0411 Secondary Air Injection System Incorrect Flow Detected  P0412 Secondary Air Injection System Switching Valve A Circuit Malfunction  P0413 Secondary Air Injection System Switching Valve A Circuit Open  P0414 Secondary Air Injection System Switching Valve A Circuit Shorted  P0415 Secondary Air Injection System Switching Valve B Circuit Malfunction  P0416 Secondary Air Injection System Switching Valve B Circuit Open  P0417 Secondary Air Injection System Switching Valve B Circuit Shorted  P0418 Secondary Air Injection System Relay "A" Circuit Malfunction  P0419 Secondary Air Injection System Relay "B" Circuit Malfunction  P0420 Catalyst System Efficiency Below Threshold (Bank 1)  P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)  P0422 Main Catalyst Efficiency Below Threshold (Bank 1)  P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)  P0424 Heated Catalyst Temperature Below Threshold (Bank 1)  P0430 Catalyst System Efficiency Below Threshold (Bank 2)  P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)  P0432 Main Catalyst Efficiency Below Threshold (Bank 2)  P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)  P0434 Heated Catalyst Temperature Below Threshold (Bank 2)  P0440 Evaporative Emission Control System Malfunction  P0441 Evaporative Emission Control System Incorrect Purge Flow  P0442 Evaporative Emission Control System Leak Detected (small leak)  P0443 Evaporative Emission Control System Purge Control Valve Circuit Malfunction  P0444 Evaporative Emission Control System Purge Control Valve Circuit Open  P0445 Evaporative Emission Control System Purge Control Valve Circuit Shorted  P0446 Evaporative Emission Control System Vent Control Circuit Malfunction  P0447 Evaporative Emission Control System Vent Control Circuit Open  P0448 Evaporative Emission Control System Vent Control Circuit Shorted  P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction  P0450 Evaporative Emission Control System Pressure Sensor Malfunction  P0451 Evaporative Emission Control System Pressure Sensor Range/Performance  P0452 Evaporative Emission Control System Pressure Sensor Low Input  P0453 Evaporative Emission Control System Pressure Sensor High Input  P0454 Evaporative Emission Control System Pressure Sensor Intermittent  P0455 Evaporative Emission Control System Leak Detected (gross leak)  P0456 EVAP Leak Monitor Small Leak Detected (CHRYSLER)  P0460 Fuel Level Sensor Circuit Malfunction  P0461 Fuel Level Sensor Circuit Range/Performance  P0462 Fuel Level Sensor Circuit Low Input  P0463 Fuel Level Sensor Circuit High Input  P0464 Fuel Level Sensor Circuit Intermittent  P0465 Purge Flow Sensor Circuit Malfunction  P0466 Purge Flow Sensor Circuit Range/Performance  P0467 Purge Flow Sensor Circuit Low Input  P0468 Purge Flow Sensor Circuit High Input  P0469 Purge Flow Sensor Circuit Intermittent  P0470 Exhaust Pressure Sensor Malfunction  P0471 Exhaust Pressure Sensor Range/Performance  P0472 Exhaust Pressure Sensor Low  P0473 Exhaust Pressure Sensor High  P0474 Exhaust Pressure Sensor Intermittent  P0475 Exhaust Pressure Control Valve Malfunction  P0476 Exhaust Pressure Control Valve Range/Performance  P0477 Exhaust Pressure Control Valve Low  P0478 Exhaust Pressure Control Valve High  P0479 Exhaust Pressure Control Valve Intermittent  P0480 Cooling Fan 1 Control Circuit Malfunction  P0481 Cooling Fan 2 Control Circuit Malfunction  P0482 Cooling Fan 3 Control Circuit Malfunction  P0483 Cooling Fan Rationality Check Malfunction  P0484 Cooling Fan Circuit Over Current  P0485 Cooling Fan Power/Ground Circuit Malfunction