This section covers OBD-II codes P0400 to P0499, which are primarily related to Exhaust Monitoring System.
| DTC Code | Description |
|---|---|
| P0400 | Exhaust gas recirculation (EGR) system -flow malfunction |
| P0401 | Exhaust gas recirculation (EGR) system -insufficient flow detected |
| P0402 | Exhaust gas recirculation (EGR) system -excessive flow detected |
| P0403 | Exhaust gas recirculation (EGR) -circuit malfunction |
| P0404 | Exhaust gas recirculation (EGR) system range/performance problem |
| P0405 | Exhaust gas recirculation (EGR) valve position sensor A low input |
| P0406 | Exhaust gas recirculation (EGR) valve position sensor A high input |
| P0407 | Exhaust gas recirculation (EGR) valve position sensor B low input |
| P0408 | Exhaust gas recirculation (EGR) valve position sensor B high input |
| P0409 | Exhaust gas recirculation (EGR) sensor A circuit malfunction |
| P040A | Exhaust Gas Recirculation Temperature Sensor “A” Circuit |
| P040B | Exhaust Gas Recirculation Temperature Sensor “A” CircuitRange/Performance |
| P040C | Exhaust Gas Recirculation Temperature Sensor “A” Circuit Low |
| P040D | Exhaust Gas Recirculation Temperature Sensor “A” Circuit High |
| P040E | Exhaust Gas Recirculation Temperature Sensor “A” Circuit Intermittent/Erratic |
| P040F | Exhaust Gas Recirculation Temperature Sensor “A”/”B” Correlation |
| P0410 | Secondary air injection (AIR) system -malfunction |
| P0411 | Secondary air injection (AIR) system -incorrect flow detected |
| P0412 | Secondary air injection (AIR) solenoid A -circuit malfunction |
| P0413 | Secondary air injection (AIR) solenoid A -open circuit |
| P0414 | Secondary air injection (AIR) solenoid A -short circuit |
| P0415 | Secondary air injection (AIR) solenoid B -circuit malfunction |
| P0416 | Secondary air injection (AIR) solenoid B -open circuit |
| P0417 | Secondary air injection (AIR) solenoid B -short circuit |
| P0418 | Secondary air injection (AIR) pump relay A -circuit malfunction |
| P0419 | Secondary air injection (AIR) pump relay B -circuit malfunction |
| P041A | Exhaust Gas Recirculation Temperature Sensor “B” Circuit |
| P041B | Exhaust Gas Recirculation Temperature Sensor “B” Circuit Range/Performance |
| P041C | Exhaust Gas Recirculation Temperature Sensor “B” Circuit Low |
| P041D | Exhaust Gas Recirculation Temperature Sensor “B” Circuit High |
| P041E | Exhaust Gas Recirculation Temperature Sensor “B” Circuit Intermittent/Erratic |
| P041F | Secondary Air Injection System Switching Valve “A” Circuit Low |
| P0420 | Catalytic converter system, bank 1 -efficiency below threshold |
| P0421 | Warm up catalytic converter, bank 1 -efficiency below threshold |
| P0422 | Main catalytic converter, bank 1 -efficiency below threshold |
| P0423 | Heated catalytic converter, bank 1 -efficiency below threshold |
| P0424 | Heated catalytic converter, bank 1 -temperature below threshold |
| P0425 | Catalytic converter temperature sensor, bank 1 |
| P0426 | Catalytic converter temperature sensor, bank 1 range/performance |
| P0427 | Catalytic converter temperature sensor, bank 1 -low input |
| P0428 | Catalytic converter temperature sensor, bank 1 high input |
| P0429 | Catalytic converter heater, bank 1 -control circuit malfunction |
| P042A | Catalyst Temperature Sensor Circuit |
| P042B | Catalyst Temperature Sensor Circuit Range/Performance |
| P042C | Catalyst Temperature Sensor Circuit Low |
| P042D | Catalyst Temperature Sensor Circuit High |
| P042E | Exhaust Gas Recirculation “A” Control Stuck Open |
| P042F | Exhaust Gas Recirculation “A” Control Stuck Closed |
| P0430 | Catalytic converter system, bank 2 -efficiency below threshold |
| P0431 | Warm up catalytic converter, bank 2 -efficiency below threshold |
| P0432 | Main catalytic converter, bank 2 -efficiency below threshold |
| P0433 | Heated catalytic converter, bank 2 -efficiency below threshold |
| P0434 | Heated catalytic converter, bank 2 -temperature below threshold |
| P0435 | Catalytic converter temperature sensor, bank 2 |
| P0436 | Catalytic converter temperature sensor, bank 2 range/performance |
| P0437 | Catalytic converter temperature sensor, bank 2 -low input |
| P0438 | Catalytic converter temperature sensor, bank 2 high input |
| P0439 | Catalytic converter heater, bank 2 -control circuit malfunction |
| P043A | Catalyst Temperature Sensor Circuit |
| P043B | Catalyst Temperature Sensor Circuit Range/Performance |
| P043C | Catalyst Temperature Sensor Circuit Low |
| P043D | Catalyst Temperature Sensor Circuit High |
| P043E | Evaporative Emission System Leak Detection Reference Orifice Low Flow |
| P043F | Evaporative Emission System Leak Detection Reference Orifice High Flow |
| P0440 | Evaporative emission (EVAP) system -malfunction |
| P0441 | Evaporative emission (EVAP) system -incorrect flow detected |
| P0442 | Evaporative emission (EV AP) system -small leak detected |
| P0443 | Evaporative emission (EVAP) canister purge valve circuit malfunction |
| P0444 | Evaporative emission (EVAP) canister purge valve open circuit |
| P0445 | Evaporative emission (EVAP) canister purge valve -short circuit |
| P0446 | Evaporative emission (EVAP) system, vent control -circuit malfunction |
| P0447 | Evaporative emission (EVAP) system, vent control -open circuit |
| P0448 | Evaporative emission (EVAP) system, vent control short circuit |
| P0449 | Evaporative emission (EVAP) system, vent valve circuit malfunction |
| P044A | Exhaust Gas Recirculation Sensor “C” Circuit |
| P044B | Exhaust Gas Recirculation Sensor “C” Circuit Range/Performance |
| P044C | Exhaust Gas Recirculation Sensor “C” Circuit Low |
| P044D | Exhaust Gas Recirculation Sensor “C” Circuit High |
| P044E | Exhaust Gas Recirculation Sensor “C” Circuit Intermittent/Erratic |
| P044F | Secondary Air Injection System Switching Valve “A” Circuit High |
| P0450 | Evaporative emission (EVAP) pressure sensor -circuit malfunction |
| P0451 | Evaporative emission (EVAP) pressure sensor range/performance problem |
| P0452 | Evaporative emission (EVAP) pressure sensor -low input |
| P0453 | Evaporative emission (EVAP) pressure sensor high input |
| P0454 | Evaporative emission (EVAP) pressure sensor circuit intermittent |
| P0455 | Evaporative emission (EVAP) system -large leak detected |
| P0456 | Evaporative emission (EVAP) system -very small leak detected |
| P0457 | Evaporative emission (EVAP) system -leak detected (filler cap loose/off) |
| P0458 | Evaporative emission (EVAP) system, EVAP valve -circuit low |
| P0459 | Evaporative emission (EVAP) system, EVAP valve -circuit high |
| P045A | Exhaust Gas Recirculation “B” Control Circuit |
| P045B | Exhaust Gas Recirculation “B” Control Circuit Range/Performance |
| P045C | Exhaust Gas Recirculation “B” Control Circuit Low |
| P045D | Exhaust Gas Recirculation “B” Control Circuit High |
| P045E | Exhaust Gas Recirculation “B” Control Stuck Open |
| P045F | Exhaust Gas Recirculation “B” Control Stuck Closed |
| P0460 | Fuel tank level sensor -circuit malfunction |
| P0461 | Fuel tank level sensor range/performance problem |
| P0462 | Fuel tank level sensor -low input |
| P0463 | Fuel tank level sensor -high input |
| P0464 | Fuel tank level sensor -circuit intermittent |
| P0465 | Evaporative emission (EVAP) canister purge flow sensor circuit malfunction |
| P0466 | Evaporative emission (EVAP) canister purge flow sensor range/performance problem |
| P0467 | Evaporative emission (EVAP) canister purge flow sensor -low input |
| P0468 | Evaporative emission (EVAP) canister purge flow sensor -high input |
| P0469 | Evaporative emission (EVAP) canister purge flow sensor circuit intermittent |
| P046A | Catalyst Temperature Sensor 1/2 Correlation |
| P046B | Catalyst Temperature Sensor 1/2 Correlation |
| P046C | Exhaust Gas Recirculation Sensor “A” Circuit Range/Performance |
| P046D | Exhaust Gas Recirculation Sensor “A” Circuit Intermittent/Erratic |
| P046E | Exhaust Gas Recirculation Sensor “B” Circuit Range/Performance |
| P046F | Exhaust Gas Recirculation Sensor “B” Circuit Intermittent/Erratic |
| P0470 | Exhaust gas pressure sensor -circuit malfunction |
| P0471 | Exhaust gas pressure sensor -range/performance problem |
| P0472 | Exhaust gas pressure sensor -low input |
| P0473 | Exhaust gas pressure sensor -high input |
| P0474 | Exhaust gas pressure sensor -circuit intermittent |
| P0475 | Exhaust gas pressure control valve -circuit malfunction |
| P0476 | Exhaust gas pressure control valve -range/performance problem |
| P0477 | Exhaust gas pressure control valve -low input |
| P0478 | Exhaust gas pressure control valve -high input |
| P0479 | Exhaust gas pressure control valve -circuit intermittent |
| P047A | Exhaust Pressure Sensor “B” Circuit |
| P047B | Exhaust Pressure Sensor “B” Circuit Range/Performance |
| P047C | Exhaust Pressure Sensor “B” Circuit Low |
| P047D | Exhaust Pressure Sensor “B” Circuit High |
| P047E | Exhaust Pressure Sensor “B” Circuit Intermittent/Erratic |
| P047F | Exhaust Pressure Control Valve “A” Stuck Open |
| P0480 | Engine coolant blower motor 1 -circuit malfunction |
| P0481 | Engine coolant blower motor 2 -circuit malfunction |
| P0482 | Engine coolant blower motor 3 -circuit malfunction |
| P0483 | Engine coolant blower motor, rationality check malfunction |
| P0484 | Engine coolant blower motor -circuit over current |
| P0485 | Engine coolant blower motor, power/earth -circuit malfunction |
| P0486 | Exhaust gas recirculation (EGR) valve position sensor B -circuit malfunction |
| P0487 | Exhaust gas recirculation (EGR) system, throttle position control -circuit malfunction |
| P0488 | Exhaust gas recirculation (EGR) system, throttle position control -range/performance |
| P0489 | Exhaust gas recirculation (EGA) system -circuit low |
| P048A | Exhaust Pressure Control Valve “A” Stuck Closed |
| P048B | Exhaust Pressure Control Valve Position Sensor/Switch Circuit |
| P048C | Exhaust Pressure Control Valve Position Sensor/Switch Circuit Range/Performance |
| P048D | Exhaust Pressure Control Valve Position Sensor/Switch Circuit Low |
| P048E | Exhaust Pressure Control Valve Position Sensor/Switch Circuit High |
| P048F | Exhaust Pressure Control Valve Position Sensor/Switch Circuit Intermittent/Erratic |
| P0490 | Exhaust gas recirculation (EGA) system -circuit high |
| P0491 | Secondary air injection (AIR) system, bank 1 malfunction |
| P0492 | Secondary air injection (AIR) system, bank 2 malfunction |
| P0493 | Engine coolant blower motor over -speed (clutch locked) |
| P0494 | Engine coolant blower motor speed -low |
| P0495 | Engine coolant blower motor speed -high |
| P0496 | Evaporative emission (EVAP) system -high purge flow |
| P0497 | Evaporative emission (EVAP) system -low purge flow |
| P0498 | Evaporative emission (EVAP) system, vent control circuit low |
| P0499 | Evaporative emission (EVAP) system, vent control -circuit high |
| P049A | Exhaust Gas Recirculation “B” Flow |
| P049B | Exhaust Gas Recirculation “B” Flow Insufficient Detected |
| P049C | Exhaust Gas Recirculation “B” Flow Excessive Detected |
| P049D | Exhaust Gas Recirculation “A” Control Position Exceeded Learning Limit |
| P049E | Exhaust Gas Recirculation “B” Control Position Exceeded Learning Limit |
| P049F | Exhaust Pressure Control Valve “B” |
| P04AA | Exhaust Pressure Control Valve “B” Position Sensor/Switch Circuit Intermittent/Erratic |
| P04AB – P04FF | ISO/SAE Reserved |
| P04DB | Crankcase Ventilation System Disconnected |
| P04E0 | EVAP System Purge Control Valve A Stuck Closed |