P0521: Engine Oil Pressure Sensor/Switch Range/Performance
Severity: high
What it means: There's a problem with the engine oil pressure reading: the sensor is reading out of its expected range.
Safe to drive? Check the oil level right away. If true oil pressure is low, stop driving.
Common symptoms
- Oil pressure warning
- Check-engine light
- Possible ticking or knocking if pressure is truly low
Likely causes, ranked
- Low oil levelDIY
- Faulty oil pressure sensor or switchDIY
- Worn oil pump or bearings, or a clogged pickupShop
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What it means: There's a problem with the engine oil pressure reading: the sensor is reading out of its expected range.
Severity: High. Safe to drive? Check the oil level right away. If true oil pressure is low, stop driving.
DIY or shop?
Check the oil level first. Confirm actual pressure with a mechanical gauge at a shop.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic. This code can involve stalling, engine damage or loss of power. If the check-engine light is flashing, or the car stalls or runs badly, stop driving and have it inspected.
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