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P24AE

P24AE on Alfa Romeo — Malfunction indicator and injection warning lights on

All the fault codes

Code P24AE indicates that the control unit is no longer receiving the signal from the sensor that measures particulate matter in the exhaust gases: the electrical circuit to that sensor is open.

System
Fuel injection
Component
PM10 sensor, exhaust particulate matter
Fault
The fault warning light and the injection light come on.
Typical symptoms
  • Engine fault warning light on
  • Injection warning light on
  • One or more diesel particulate filter codes are stored in the diagnostic memory
  • The fault returns after being cleared in diagnosis
Vehicles affected
  • Alfa Romeo Stelvio 2.2 Diesel 16v
  • Alfa Romeo Giulia 2.2 Diesel 16v
Main code
  • P24AE Particulate matter sensor, circuit open
Related codes
  • P24D1 Diesel particulate filter regeneration incomplete
  • P14D1 SCR exhaust gas sensor signal fault

On this fault the diagnostic tool often returns several codes together.

Solution

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The cause and the repair are on Sema Repair

On Sema Repair this code is linked to verified case studies, with the confirmed cause case by case, the job step by step, indicative times, the manufacturer's notes and a photograph of the component with the point of intervention highlighted.

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Frequently asked questions about P24AE

Can the vehicle be driven with fault P24AE active?

The vehicle remains drivable, but the warning light stays on and emissions monitoring is compromised. The repair should be scheduled, not put off indefinitely.

Is it enough to clear the code from the diagnostic memory?

No. If the sensor is the cause, the code will come back after a few driving cycles. Clearing it only serves to check whether the fault is current rather than left over from an earlier repair.

Is the particulate matter sensor the same as the differential pressure sensor?

No, and this is the most common misunderstanding about this code. The PM10 sensor measures particulate matter in the exhaust gases; the differential pressure sensor measures the pressure across the diesel particulate filter. They are two separate components, and working on the second one will not fix P24AE.