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

P2348

Cylinder 9 Pressure Sensor Circuit

A general electrical fault on the cylinder 9 combustion pressure sensor — used on engines with closed-loop combustion control (e.g. some Volvo and BMW direct-injection diesels) to measure cylinder pressure directly via a sensor at the glow plug or injector position.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 48

Possible causes

  • Open circuit in sensor or wiring high
  • Connector loose or oxidised medium

Inspection / repair

  • Difficulty: hard
  • DIY: shop recommended
  • Estimated cost: 400–1800 €
  • Estimated time: 1.5–5 h
  • Component: cylinder pressure sensor 9
  • Component: cylinder pressure wiring 9
  • MIL / check engine light
  • emissions-relevant

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