P0520: Engine oil pressure sensor / switch circuit malfunction
Stop driving. Get it towed or fixed first.
Can I drive with P0520?
No, stop driving safely as soon as possible. Oil pressure cannot be confirmed. Stop driving immediately until actual oil level and pressure are checked.
What does P0520 mean?
P0520 stands for Engine Oil Pressure Sensor/Switch Circuit Malfunction.
Symptoms you may notice
- Red oil pressure warning light or chime on instrument cluster
- Ticking or tapping valvetrain noise if oil is genuinely low
- Oil pressure gauge reading zero or abnormally low
How much does it cost to fix?
Repair costs for code P0520 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Defective oil pressure sensor/sender unit
- Low engine oil level
- Damaged sensor wiring harness near oil filter
- Genuine loss of engine oil pressure (failing oil pump)
What to do next
- PULL OVER SAFELY AND SHUT OFF ENGINE IMMEDIATELY. Check oil dipstick.
- If the oil level is empty, do not run the engine; add oil before cranking.
- Have a mechanical oil pressure gauge connected to verify actual oil pressure.
Last updated: October 2026
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General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code P0520 involves the engine's lifeblood: oil pressure. If oil pressure is genuinely lost, the engine bearings will melt and seize very quickly, resulting in severe damage. Treat oil pressure warnings with high caution.