OBD2 Diagnostic Trouble Codes

Browse our complete database of OBD2 fault codes. Each code page includes plain-English explanations, ranked causes, estimated repair costs, and vehicle-specific diagnostic guides powered by Skanyx AI data.

Ignition

P0016High

Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)

ToyotaHondaVolkswagen+1 more

P0340High

Camshaft Position Sensor Circuit Malfunction

ToyotaHondaVolkswagen+1 more

Fuel System

P0101Moderate

Mass Air Flow Sensor Range/Performance

ToyotaHondaVolkswagen+1 more

P0171Moderate

System Too Lean (Bank 1)

ToyotaHondaVolkswagen+1 more

P0172Moderate

System Too Rich (Bank 1)

ToyotaHondaVolkswagen+1 more

P0174Moderate

System Too Lean (Bank 2)

ToyotaHondaVolkswagen+1 more

P0507Moderate

Idle Control System RPM Higher Than Expected

ToyotaHondaVolkswagen+1 more

Cooling System

P0128Low

Coolant Thermostat Below Regulating Temperature

ToyotaHondaVolkswagen+1 more

Emissions

P0135Low

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

ToyotaHondaVolkswagen+1 more

P0141Low

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)

ToyotaHondaVolkswagen+1 more

P0401Low

Exhaust Gas Recirculation (EGR) Flow Insufficient

ToyotaHondaVolkswagen+1 more

P0420Moderate

Catalyst System Efficiency Below Threshold (Bank 1)

ToyotaHondaVolkswagen+1 more

P0430Moderate

Catalyst System Efficiency Below Threshold (Bank 2)

ToyotaHondaVolkswagen+1 more

Misfire

P0300High

Random/Multiple Cylinder Misfire Detected

ToyotaHondaVolkswagen+1 more

EVAP System

P0446Low

Evaporative Emission System Vent Control Circuit

ToyotaHondaVolkswagen+1 more

Diagnose your car with Skanyx AI

Connect any Bluetooth OBD2 adapter and get plain-English explanations, severity ratings, and repair cost estimates - instantly.

Download Skanyx