Engine Oil Pressure Sensor/Switch Circuit Malfunction
Engine · Lubrication
The engine oil pressure sensor or switch circuit has a general electrical fault. The ECU cannot reliably read oil pressure. If actual oil pressure is low and the sensor is not reporting correctly, catastrophic engine damage can occur within minutes.
- Failed oil pressure sensor/switchMost common
- Wiring harness damage to sensorCommon
- Low actual oil pressure (check oil level first)Common
- Faulty ECMLess common
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Frequently asked questions
What does P0520 mean?
The engine oil pressure sensor or switch circuit has a general electrical fault. The ECU cannot reliably read oil pressure. If actual oil pressure is low and the sensor is not reporting correctly, catastrophic engine damage can occur within minutes.
Is P0520 serious?
Fix immediately — oil pressure monitoring critical to prevent engine damage.
How much does it cost to fix P0520?
Repair costs for P0520 range from $75 – $200 depending on the root cause and your vehicle.
Can I drive with P0520?
No — this code indicates a serious issue. Stop driving and have the vehicle inspected immediately.