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OBDEurope Fault Codes Library

Welcome to the OBDEurope Fault Code Library. 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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P2xxx – Emission Control

Emission-related codes including EGR, DPF, NOx, SCR and catalyst efficiency.

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Browse Fault Codes by System

Air/Fuel System

Fuel trim, lean/rich mixture and airflow issues.

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Engine Sensors

IAT, coolant temp, O2 sensors, MAP, MAF and more.

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Fuel System

Fuel pressure, injectors, pump and delivery faults.

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Ignition System

Coils, spark plugs and misfire-related issues.

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VVT System

Variable valve timing and camshaft issues.

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Electrical System

ECU, PCM, CAN bus, voltage and communication faults.

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Throttle Control

Throttle body, idle control and airflow regulation faults.

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Transmission

Gearbox, shift solenoid and drivetrain faults.

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EVAP System

Evaporative emissions leaks and purge faults.

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BMW Fault Codes

Manufacturer-specific BMW diagnostic codes.

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Ford Fault Codes

Manufacturer-specific Ford diagnostic codes.

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Nissan Fault Codes

Manufacturer-specific Nissan diagnostic codes.

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Toyota Fault Codes

Manufacturer-specific Toyota diagnostic codes.

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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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