OBD-II Code · Engine
P0520
Engine Oil Pressure Sensor/Switch Circuit Malfunction
Severity
critical
Highest on our scale. Expect major repair cost if it is ignored.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$100
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
For sensor to $2,500+ for pump
Oil pressure sensor fault — could be sensor OR actual low oil pressure.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Oil pressure warning light
- Check engine light
- Engine noise if real low pressure
Likely causes
- Failed oil pressure sensorMost common
- Low oil level
- Failing oil pump (serious)
- Wiring
Look up another code
P0520 — frequently asked
What does a P0520 code mean?
Oil pressure sensor fault — could be sensor OR actual low oil pressure.
What causes a P0520 code?
Common causes: Failed oil pressure sensor; Low oil level; Failing oil pump (serious); Wiring.
What are the symptoms of a P0520 code?
Typical symptoms: Oil pressure warning light; Check engine light; Engine noise if real low pressure.
Is it safe to drive with a P0520 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $100 for sensor to $2,500+ for pump.
How do I diagnose a P0520 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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