P24AEParticulate Matter Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The resistive particulate matter sensor behind the diesel particulate filter collects soot on interlocking electrodes; a rising current between them shows that particles are leaking through the filter. P24AE covers a fault in that electrode circuit. Ford's 2023 diesel summary checks it after each sensor regeneration at 200 to 425 °C over 120 s and sets the code if more than 5 µA still flows although the electrodes should be clean. VW's 2014 Touareg list ties P24AE to the electrode voltage leaving 0.30 to 4.70 V and to a functional check with too little or too unchanged measuring current. Special coverage 16018 from GM extended the warranty for Cruze 2.0 diesel sensors of model years 2014–2015 that set P24AE or P24AF after contamination or moisture damage. P24AF is the plausibility check during sensor regeneration.
- What you may notice
- Malfunction indicator lamp on
- Filter efficiency monitor cannot complete
- Likely causes
- LikelySensor element contaminated or damaged by moisture
- PossibleHarness or connector to the sensor control unit damaged by heat or water
- RareFault in the separate sensor control unit
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €150 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.