Error code

OBD2 P0520

OBD2P0520
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Engine Oil Pressure Sensor/Switch Circuit.

Severity

moderateCan drive, but monitor symptoms closely. Engine may shut down if severe.

Summary

P0520 indicates a malfunction with the engine oil pressure sensor/switch circuit. This issue can affect the engine's ability to monitor and report accurate oil pressure.

Symptoms

  • Illuminated warning light
  • Engine may shut down due to low oil pressure (code P2105 also present)
  • Mechanical noises such as ticking, thudding, knocking, or rumbling sounds
  • Engine misfires

Common Causes

  • Defective oil pressure switch
  • Damaged wiring and connectors
  • Use of unsuitable engine oil
  • Poor maintenance (e.g., not changing oil regularly)
  • Excessive mechanical wear in the engine
  • Mechanical failure of internal components like the oil pump or valve lifters

Diagnosis

  1. Check and record all fault codes and freeze frame data.
  2. Inspect wiring for damage or corrosion.
  3. Perform resistance, reference voltage, and continuity checks on the oil pressure switch circuit.
  4. Verify actual oil pressure using a dedicated gauge.

Fixes

  • Replace defective oil pressure switch

FAQ

Can I drive with P0520?

You can drive, but monitor symptoms closely. The engine may shut down if the issue is severe.

What causes P0520?

Common causes include a faulty oil pressure switch, damaged wiring, or poor maintenance practices.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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