Code Definition

P0520 — Engine Oil Pressure Sensor/Switch Circuit Malfunction

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0520

P0520 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0520 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0520 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0520 fault code is set when the Engine Control Module (ECM) detects a malfunction in the circuit of the engine oil pressure sensor or switch. This sensor plays a crucial role in monitoring the oil pressure in the engine. Adequate oil pressure is essential for proper lubrication and functioning of the engine components. A malfunction in the oil pressure sensor or switch circuit can lead to incorrect oil pressure readings, which might cause the engine to run without sufficient lubrication, leading to increased wear or even severe engine damage. Causes of this malfunction could include a fau...

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