Is It Safe to Drive With a P0520 Code?
Common Symptoms of a P0520 Fault
P0520 Symptoms at a Glance
Oil pressure warning light
EML on
Possible engine knock or ticking
Engine may enter protection mode
Possible Causes of P0520
A P0520 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
Common Causes of P0520
Oil Pressure Sensor Wiring Fault
Wiring or connector to the oil pressure sensor is damaged.
Oil Pressure Sensor Failure
The sensor itself has failed — may not indicate actual oil pressure.
Low Oil Level
Oil level too low — check immediately before assuming sensor fault.
ECU Input Fault
ECU circuit reading the oil pressure sensor.
Why we don't list the exact part: A P0520 code tells you what's happening but not why. Replacing parts without diagnosis is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0520 and Your MOT
A stored P0520 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure. Get the fault diagnosed and repaired, then have the code cleared before booking your test.