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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P0508 Idle Air Control System Circuit Low
Generic Vehicle Speed and Idle Control System High severity
P0510 Closed Throttle Position Switch Malfunction
Generic Vehicle Speed and Idle Control System High severity
P0511 Idle Air Control Circuit Malfunction
Generic Vehicle Speed and Idle Control System High severity
P0512 Starter Request Circuit
Generic Vehicle Speed and Idle Control System High severity
P0514 Temperature Sensor Rationality
Generic Vehicle Speed and Idle Control System High severity
P0515 Battery Temperature Sensor System
Generic Vehicle Speed and Idle Control System High severity
P0517 Battery Temperature Sensor Circuit High
Generic Vehicle Speed and Idle Control System High severity
P0518 Idle Air Control Circuit Intermittent
Generic Vehicle Speed and Idle Control System High severity
P0519 Idle Air Control System Performance
Generic Vehicle Speed and Idle Control System High severity
P0521 Engine Oil Pressure Sensor/Switch Circuit Range/Performance
Generic Vehicle Speed and Idle Control System High severity
U28D4 /codes/dtcs/u28d4
Communication Network System
P0522 Engine Oil Pressure Sensor/Switch Circuit Low Voltage
Generic Vehicle Speed and Idle Control System High severity
P0524 Engine Oil Pressure Sensor/Switch Circuit
Generic Vehicle Speed and Idle Control System High severity
P0525 Cruise Control Servo Control Circuit Range/Performance
Generic Vehicle Speed and Idle Control System Medium severity
P0526 Cooling Fan Speed Sensor Circuit
Generic Auxiliary Emissions Control High severity

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