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 1–24 of 35 codes
P0400
Exhaust Gas Recirculation (EGR) "A" Flow Malfunction
P0401
Exhaust Gas Recirculation (EGR) "A" Flow Insufficient Detected
P0402
Exhaust Gas Recirculation (EGR) "A" Flow Excessive Detected
P0403
Exhaust Gas Recirculation (EGR) "A" Control Circuit
P0404
Exhaust Gas Recirculation (EGR) "A" Control Circuit Range/Performance
P0405
Exhaust Gas Recirculation (EGR) Sensor "A" Circuit Low
P0406
Exhaust Gas Recirculation (EGR) Sensor "A" 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
P0418
Secondary Air Injection System Control "A" Circuit
P0420
Catalyst System Efficiency Below Threshold (Bank 1)
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