Common Honda Fault Codes

Most common OBD-II codes reported for Honda vehicles

P0300

Random/Multiple Cylinder Misfire Detected

critical
→P0420

Catalyst System Efficiency Below Threshold (Bank 1)

moderate
→P0171

System Too Lean (Bank 1)

moderate
→P0401

Exhaust Gas Recirculation Flow Insufficient

moderate
→P0128

Coolant Temperature Below Thermostat Regulating Temperature

minor
→P0113

Intake Air Temperature Sensor Circuit High Input

minor
→P0302

AI diagnosis available

→P0440

AI diagnosis available

→P0715

AI diagnosis available

→U0101

AI diagnosis available

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