OBD fault code library

Look up any P or U code to see what it means, what causes it, the parts involved and how it gets fixed.

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Fault codes

P2240 O2 Sensor Positive Current Ctrl Circuit/Open Bank2 Sensor 1

Fuel and Air Metering Medium severity

P2244 O2 Sensor Ref Voltage Performance Bank1 Sensor 1

Fuel and Air Metering Medium severity

P2247 O2 Sensor Ref Voltage Circuit/Open Bank2 Sensor 1

Fuel and Air Metering Medium severity

P2251 O2 Sensor Negative Current Ctrl Circuit/Open Bank1 Sensor 1

Fuel and Air Metering Medium severity

P2253 O2 Sensor Negative Current Ctrl Circuit High Bank1 Sensor 1

Fuel and Air Metering Medium severity

P2256 O2 Sensor Negative Current Ctrl Circuit High Bank2 Sensor 1

Fuel and Air Metering Medium severity

P2261 Turbocharger/Supercharger Bypass Valve-Mechanical

Injector Circuit High severity

P2268 Water in Fuel Sensor Circuit Interim

Fuel and Air Metering High severity

P2270 O2 Sensor Signal Stuck Lean Bank 1 Sensor 2

Fuel and Air Metering Medium severity

P2273 O2 Sensor Signal Stuck Rich Bank 2 Sensor 2

Fuel and Air Metering Medium severity

P2276 O2 Sensor Signal Stuck Lean Bank 2 Sensor 3

Fuel and Air Metering Medium severity

P2280 Air Flow Restriction / Air Leak Between Air Filter and MAF

Fuel and Air Metering High severity

P2282 Air Leak Between Throttle Body and Intake Valves

Fuel and Air Metering High severity

P2287 Injector Ctrl Press Sensor Circuit Interim

Injector Circuit High severity

P2291 Injector Ctrl Press Too Low-Engine Cranking

Injector Circuit High severity