Oil Pressure Sensor
What it is
The oil pressure sensor (or switch) reads engine oil pressure and reports it to the computer and the dashboard oil light or gauge.
What it does
It warns you if oil pressure drops dangerously low. A faulty sensor can trigger a false low-oil-pressure warning or set P0520 even when actual pressure is fine — but a real low-pressure reading must never be ignored.
Symptoms of failure
- Code P0520 (oil pressure sensor circuit)
- Oil pressure warning light flickering or staying on
- Wrong or jumpy oil pressure gauge
- Oil leak from the sensor
- Check engine light
Common fault codes
Which vehicles need it
All engines. Important: confirm real oil pressure with a mechanical gauge before assuming the sensor is at fault.
Replacement cost
| DIY (part only) | $15–$80 |
|---|---|
| At a shop (parts + labor) | $110–$300 |
| Replacement interval | No set interval — replace on failure or if it leaks. |
| DIY difficulty | Easy–Moderate (DIY) — one sensor; access varies, some are awkward |
| Recommended brands | Standard Motor Products, Bosch, Delphi, ACDelco |
Where to buy the part
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Frequently asked questions
Is it safe to drive with an oil pressure light on?
Not until you confirm it is just the sensor. A real loss of oil pressure can destroy the engine in minutes. Stop, check the oil level, and verify pressure with a mechanical gauge before driving on a P0520.
Can a bad oil pressure sensor cause a false warning?
Yes. A failing sensor can flicker the warning light or set P0520 with healthy actual pressure. Always confirm with a mechanical gauge before replacing the sensor.