Engine mechanicalSeverity High: diagnose before driving on

P0521Engine Oil Pressure Sensor/Switch "A" Range/Performance

What it means

The oil pressure sensor signal is electrically possible, but it doesn't make sense compared with other sensors or with what the engine is doing. The oil pressure sensor measures the engine oil pressure.

Symptoms

Oil pressure warning light
Possibly engine noise (ticking or knocking)
Reduced power on some engines

Common causes

Real low oil pressure (oil level, worn pump or bearings)
Faulty sensor
Wrong oil grade

What to check first

Check the oil level first
Measure oil pressure with a mechanical gauge
Compare the gauge with the sensor reading

Can I drive with P0521? Not recommended. P0521 can lead to stalling, limp mode or engine damage; diagnose it before driving further.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0521: questions and answers

What does P0521 mean?

P0521: Engine Oil Pressure Sensor/Switch "A" Range/Performance. The oil pressure sensor signal is electrically possible, but it doesn't make sense compared with other sensors or with what the engine is doing. The oil pressure sensor measures the engine oil pressure.

What are the symptoms of P0521?

Oil pressure warning light. Possibly engine noise (ticking or knocking). Reduced power on some engines.

What causes P0521?

Real low oil pressure (oil level, worn pump or bearings). Faulty sensor. Wrong oil grade.

How do you diagnose P0521?

1. Check the oil level first 2. Measure oil pressure with a mechanical gauge 3. Compare the gauge with the sensor reading

Can I drive with P0521?

Not recommended. P0521 can lead to stalling, limp mode or engine damage; diagnose it before driving further.