OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Powertrain generic / SAE

P252E

Engine Oil Quality Sensor Circuit Intermittent/Erratic

The oil quality sensor signal jumps or drops out — usually a loose connector at the oil pan, an oil-soaked harness or vibration cracks at the sensor housing.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 2E

Possible causes

  • Loose oil-soaked connector high
  • Cracked sensor housing medium
  • Connector with intermittent contact under vibration low

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 120–500 €
  • Estimated time: 0.5–2 h
  • Component: oil quality sensor
  • Component: sensor wiring

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication