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

P24E2

NH3 Sensor Circuit Range or Performance

Same as P24E1 with the signal in plausible range yet not matching the engine model.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / E2

Possible causes

  • Sensor element drifted high

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 400–1200 €
  • Estimated time: 1–3 h
  • Component: nh3 sensor
  • MIL / check engine light
  • emissions-relevant

Sources

References

sae:J2012

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