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

P055F

Engine Oil Pressure Out of Range

The measured oil pressure is far outside the expected range for current engine speed and oil temperature - either too low (oil pump weak, oil level low, bearing wear) or anomalously high (relief valve stuck closed, blocked oil cooler).

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 5F

Possible causes

  • Oil pump worn or oil level low high
  • Pressure relief valve stuck medium

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 200–2500 €
  • Estimated time: 1–8 h
  • Component: oil pump
  • Component: oil pressure sensor a
  • Component: oil relief valve
  • MIL / check engine light

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