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OBDEurope Fault Codes Library

Welcome to the OBDEurope Fault Code Library. Here you can search, browse and diagnose any OBD2 fault code. Each code includes symptoms, causes, diagnostic steps, and recommended tools.

Browse Fault Codes by Category

Select a category below to explore related OBD2 fault codes.

P0xxx – Generic Powertrain Codes

Standard OBD2 codes used by all manufacturers.

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P1xxx – Manufacturer-Specific Codes

Codes unique to specific vehicle brands.

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Fuel & Air Mixture Codes

Lean/rich mixture issues such as P0171 and P0174.

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Airflow & MAF/MAP Sensor Codes

MAF/MAP sensor and airflow-related issues.

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Oxygen Sensor & Catalyst Codes

O2 sensor, heater circuit and catalyst efficiency faults.

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EVAP System Codes

Evaporative emissions system leaks and faults.

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Ignition & Misfire Codes

Ignition coil, spark and misfire-related issues.

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Throttle & Idle Control Codes

Throttle body, idle control and airflow regulation faults.

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Engine Timing & VVT Codes

Timing chain, camshaft and VVT system issues.

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Turbocharger & Boost Codes

Boost pressure and turbocharger performance faults.

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Transmission & Drivetrain Codes

Transmission, gearbox and drivetrain-related issues.

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Electrical & CAN Bus Codes

Electrical faults, communication errors and ECU/PCM issues.

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Most Common Fault Codes

Recommended Diagnostic Tools

To diagnose the real cause behind any OBD2 fault code, you need a scanner that can read live data, freeze‑frame information and manufacturer‑specific codes.

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