Description
Function of the Oil Pressure Sensor
The oil pressure sensor monitors the engine’s oil pressure and sends this information to the dashboard gauge or warning light. Adequate oil pressure is essential for engine lubrication — low pressure means insufficient oil reaching critical components. A faulty sensor gives false readings, either failing to warn of genuinely low pressure or causing an unnecessary warning. Always investigate an oil pressure warning immediately, as running without oil pressure destroys an engine in minutes.
Common Diagnostic Trouble Codes (DTCs)
A generic OBD reader displays the standard 5-character code shown below.
- P0520 — Engine Oil Pressure Sensor/Switch Circuit
- P0521 — Engine Oil Pressure Sensor/Switch Range/Performance
- P0522 — Engine Oil Pressure Sensor/Switch Circuit Low Voltage
- P0523 — Engine Oil Pressure Sensor/Switch Circuit High Voltage
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