What does code P0520 mean on a Smart and is it safe to drive?
P0520: Engine Oil Pressure Sensor/Switch Circuit Malfunction. Here's what it means on your Smart, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
The PCM has detected an electrical fault in the oil pressure sensor circuit. This may trigger the oil light even if pressure is normal.
Common causes for your Smart
- Failed oil pressure sensor
- Wiring short or open in sensor circuit
- Rarely, actual low oil pressure
Symptoms
- Check Engine Light
- Oil pressure warning light may flicker or stay on
- Possible ticking/knocking if real low pressure is present
Typical fixes
- Verify actual oil pressure with a mechanical gauge
- Replace oil pressure sensor
- Repair wiring/connectors
Repair cost range
For a Smart, repairs for P0520 often fall between $120 and $500, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.