Car Fault Codes
OBD-II trouble codes explained: meaning, causes, symptoms, fixes and typical repair cost.
Category
All
Fuel & air
Ignition & misfire
Emissions & exhaust
Cooling & lubrication
Speed & idle
Engine computer & electrical
Transmission
Hybrid & EV
Network
Body
Chassis & brakes
Showing 49–72 of 122 codes
P0421
Warm Up Catalyst Efficiency Below Threshold (Bank 1)
P0430
Catalyst System Efficiency Below Threshold (Bank 2)
P0431
Warm Up Catalyst Efficiency Below Threshold (Bank 2)
P0440
Evaporative Emission (EVAP) System Malfunction
P0441
Evaporative Emission (EVAP) System Incorrect Purge Flow
P0442
Evaporative Emission (EVAP) System Leak Detected (Small Leak)
P0443
EVAP System Purge Control Valve "A" Circuit
P0444
EVAP System Purge Control Valve "A" Circuit Open
P0445
EVAP System Purge Control Valve "A" Circuit Shorted
P0446
EVAP System Vent Control Circuit
P0447
EVAP System Vent Control Circuit Open
P0448
EVAP System Vent Control Circuit Shorted
P0449
EVAP System Vent Valve/Solenoid Circuit
P0450
EVAP System Pressure Sensor/Switch Circuit
P0451
EVAP System Pressure Sensor/Switch Circuit Range/Performance
P0452
EVAP System Pressure Sensor/Switch Circuit Low
P0453
EVAP System Pressure Sensor/Switch Circuit High
P0454
EVAP System Pressure Sensor/Switch Circuit Intermittent/Erratic
P0455
Evaporative Emission (EVAP) System Leak Detected (Large Leak)
P0456
Evaporative Emission (EVAP) System Leak Detected (Very Small Leak)
P0457
EVAP System Leak Detected (Fuel Cap Loose/Off)
P0496
Evaporative Emission (EVAP) System High Purge Flow
P0497
Evaporative Emission (EVAP) System Low Purge Flow
P1000
OBD-II Monitor Testing Not Complete