Engine and gearbox (P)
P0521: Engine oil pressure sensor performance issue
The engine oil pressure sensor is sending a signal that is not within the expected range. This could indicate a problem with the sensor itself, the oil level, or the actual oil pressure.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Engine warning light on
- Low oil pressure warning
- Engine noise
- Poor engine performance
Common causes
- Faulty oil pressure sensor
- Incorrect oil level
- Oil pump failure
- Blocked oil passages
How to check it yourself
- Check engine oil level and top up if necessary
- Inspect the oil pressure sensor and wiring
- Use a mechanical gauge to verify oil pressure
- Inspect for oil leaks
Can I keep driving?
Do not drive the car if the oil pressure warning light is on, as this can cause severe engine damage.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer