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Car repair estimate checker

Check Engine Code Guides

What the code means, what it should cost to fix, and the misdiagnosis to watch for.

Got a code? Get a diagnosis.

Enter the code(s) from your scanner or the free parts-store readout — add your vehicle for causes and fair cost ranges specific to your car. Multiple codes often share one root cause, so enter everything it threw. BMW hex codes (like 2A87) and VW/Audi 5-digit codes (like 16825) work too.

Code(s) — up to 5, separated by spaces or commas

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Browse code guides

P0420Catalyst System Efficiency Below Threshold (Bank 1)P0300Random/Multiple Cylinder Misfire Detected P0171System Too Lean (Bank 1)P0455Evaporative Emission System Leak Detected (Large Leak)P0442Evaporative Emission System Leak Detected (Small Leak)P0128Coolant Thermostat Below Regulating Temperature P0301Cylinder 1 Misfire Detected P0430Catalyst System Efficiency Below Threshold (Bank 2)P0401Exhaust Gas Recirculation Flow Insufficient P0011Camshaft Position Timing Over-Advanced (Bank 1)P0113Intake Air Temperature Sensor Circuit High P0507Idle Air Control System RPM Higher Than Expected P0700Transmission Control System Malfunction P0740Torque Converter Clutch Circuit Malfunction P0135O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)P0562System Voltage Low P0520Engine Oil Pressure Sensor Circuit Malfunction P0606PCM/ECM Processor Fault

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