P0520
System
Powertrain (Engine)
Scanner required
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Engine Oil Pressure Sensor/Switch Circuit Malfunction

Understand P0520, common causes, and the right TOPDON scanner to diagnose it.

Oil pressure sensor circuit fault — verify actual oil pressure before assuming sensor only.

Common symptoms

  • Oil warning light
  • Check engine light
  • Ticking if truly low pressure

Typical causes

  • Failed oil pressure sensor
  • Wiring damage
  • Actual low oil pressure
  • Wrong oil viscosity

What scanner do you need?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Recommended TOPDON scanners

Frequently asked questions

Can I diagnose P0520 with a basic code reader?
P0520 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P0520?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.