KlaroFault codeP0520
MODERATEEngine Oil Pressure Sensor/Switch Circuit Malfunction
What this code means
Engine Oil Pressure Sensor/Switch Circuit Malfunction.
P0520 is a generic code: it means the same thing on every make. P0520 belongs to family P05xx — Idle speed and vehicle speed control. Its page explains how to read a code and groups all its codes by part.
Type of fault
The control unit has detected an electrical anomaly on this circuit without saying exactly which. Diagnosis starts with a visual check of the wiring and connector, then measuring the component — resistance, supply, ground — with a multimeter.
Engine oil pressure sensor
This sensor or switch measures the pressure in the engine's lubrication circuit. It lights the oil warning and, on some engines, lets the control unit control a variable-flow oil pump or protect the engine.
What you notice
An oil pressure warning that comes on, flickers, or does not light at all with ignition on.
How to check it
Check the oil level immediately: if the warning lights while driving, stop the engine. If the level is fine, check the sensor's connector, often near the oil filter, and have a mechanic measure the real pressure with a gauge before blaming the sensor.
What to do
Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.
Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →
How to read this code
- PPowertrain
- 0standardised code
- 5Idle speed and vehicle speed control
- 20P0520
