Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Oil pressure warning light ON.

Possible Causes

- Low oil level or motor mechanical fault - Open or short oil level sensor circuit condition - Poor oil level sensor electrical connection - Faulty oil pressure sensor

When Detected

The P0521 is detected when the signal sent from oil pressure sensor to PCM goes out of range.

Description

The PCM continuously monitors the engine oil pressure. The Oil Pressure Sensor/Switch sends a signal to the PCM when the engine is running.