Common Toyota Fault Codes

Most common OBD-II codes reported for Toyota vehicles

P0171

System Too Lean (Bank 1)

moderate
→P0301

AI diagnosis available

→P0420

Catalyst System Efficiency Below Threshold (Bank 1)

moderate
→P0128

Coolant Temperature Below Thermostat Regulating Temperature

minor
→P0335

Crankshaft Position Sensor A Circuit Malfunction

critical
→P0011

Camshaft Position Timing Over-Advanced (Bank 1)

moderate
→P0441

AI diagnosis available

→P0505

AI diagnosis available

→C0040

AI diagnosis available

→U0100

AI diagnosis available

→

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