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

P04C3

Fuel Fill Door Lock Position Sensor Circuit

A general circuit fault is detected on the fuel fill door lock position sensor or switch. Without it the ECU cannot determine whether the lock has actually engaged or released.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / C3

Possible causes

  • Open in sensor circuit high

Inspection / repair

  • Difficulty: easy
  • DIY: possible
  • Estimated cost: 80–280 €
  • Estimated time: 0.5–1.4 h
  • Component: fuel fill door lock position sensor

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