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P2002 – Diesel Particulate Filter Efficiency Below Threshold – Fiat/Alfa/Lancia MultiJet (Fiat / Alfa Romeo / Lancia 1.3 MultiJet)

Fault code P2002 means "Diesel Particulate Filter Efficiency Below Threshold – Fiat/Alfa/Lancia MultiJet". It is common on 1.3 MultiJet (Panda, Punto, 500, Doblò, Fiorino, Ypsilon), 1.6 / 2.0 MultiJet (Bravo, Tipo, 500X, Doblò, Giulietta, Delta), 2.2 / 2.0 MultiJet (Ducato, Giulia, Stelvio) engines. Below are the real-world causes, step-by-step tests and OEM part numbers.

Last updated

P2002 quick summary

Fault codeP2002
MeaningDiesel Particulate Filter Efficiency Below Threshold – Fiat/Alfa/Lancia MultiJet
SystemPowertrain (Engine & Transmission)
VehiclesFiat / Alfa Romeo / Lancia
Common on1.3 MultiJet (Panda, Punto, 500, Doblò, Fiorino, Ypsilon), 1.6 / 2.0 MultiJet (Bravo, Tipo, 500X, Doblò, Giulietta, Delta), 2.2 / 2.0 MultiJet (Ducato, Giulia, Stelvio)
SeverityMedium
Can I drive?Yes in the short term, but the engine may go into limp mode and oil dilution increases. Fix it soon.
Repair cost€0 – €1,500

Symptoms of P2002

  • DPF warning light or 'DPF clogged' message
  • Reduced power
  • Oil level rising, oil change warning
  • Frequent regenerations
  • Higher fuel consumption

Most common causes of P2002 (most likely first)

Mechanic's Pro Tip

MultiJet engines dilute the oil with diesel during regeneration, so the ECU tracks oil degradation and asks for an oil change early. Check the oil level – if it is too high, change the oil and reset the oil degradation counter with diagnostic software (e.g. MultiECUScan) before forcing a regeneration. Check the differential pressure sensor first, it is a common fault.

  1. 1.DPF loaded with soot from short trips

    Most likely

  2. 2.Faulty differential pressure sensor or hoses

  3. 3.EGR or injector fault causing excess soot

  4. 4.Oil degradation counter not reset after oil change

  5. 5.Ash-loaded DPF at high mileage

Step-by-step diagnostic guide

  1. 1

    Read codes and DPF soot load with MultiECUScan, Examiner or a capable scanner.

  2. 2

    Check the oil level and change the oil if diluted; reset the oil degradation value.

  3. 3

    Check the differential pressure sensor and hoses.

  4. 4

    Fix any EGR or injector faults.

  5. 5

    Run a forced regeneration; clean or replace the DPF if it is ash-loaded.

How do I read fault codes? →Where the OBD2 port is, which scanner to use and how to read and clear codes step by step.

Frequently asked questions

Why does my Fiat ask for oil changes so often?

The ECU calculates oil dilution from regenerations. Many short trips mean many regenerations and earlier oil changes.

Do I need to reset anything after the oil change?

Yes, on MultiJet engines the oil degradation counter must be reset with diagnostic software, otherwise the warning returns.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.