P0520: Engine Oil Pressure Sensor/Switch Circuit Malfunction
Can you still drive? STOP and verify oil pressure immediately. If the oil light is on and actual oil pressure is low, do not drive. If pressure is verified normal and only the sensor is faulty, driving is safe.
What Does P0520 Mean?
Code P0520 indicates a malfunction in the engine oil pressure sensor or its circuit. The oil pressure sensor monitors engine oil pressure and sends data to the ECM and instrument cluster. A faulty sensor can trigger a false low oil pressure warning. However, it is critical to verify actual oil pressure before assuming the sensor is faulty.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Failed oil pressure sensor
- Wiring issue to sensor
- Corroded connector
- Actually low oil pressure from worn engine
- Low oil level
Symptoms
- Check engine light on
- Oil pressure warning light on dashboard
- Inaccurate oil pressure gauge reading
- Possible engine noise if actual low oil pressure
Diagnostic Steps
- 1Check engine oil level immediately
- 2Install mechanical oil pressure gauge to verify actual pressure
- 3Check sensor wiring and connector for damage
- 4Measure sensor resistance and compare to specifications
- 5Check for oil leaks
- 6Inspect oil pump if actual pressure is low
Recommended Parts & Tools
oil pressure sensor
mechanical oil pressure gauge
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $30 - $500 |
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Frequently Asked Questions
Should I stop driving with the oil pressure light on?
Yes, stop as soon as safely possible. Check the oil level first. If oil level is full, the sensor may be faulty, but verify with a mechanical gauge before driving.
How do I know if it is the sensor or actual low oil pressure?
A mechanic can install a mechanical oil pressure gauge to verify actual pressure. Normal oil pressure is typically 25-65 PSI at operating temperature.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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