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P2002 – Diesel Particulate Filter Efficiency Below Threshold – Renault/Dacia dCi (Renault / Dacia 1.5 dCi K9K with DPF)

Fault code P2002 means "Diesel Particulate Filter Efficiency Below Threshold – Renault/Dacia dCi". It is common on 1.5 dCi K9K with DPF (about 2009 onward), 1.6 dCi R9M (Megane, Scenic, Kadjar, Trafic), Dacia Duster, Sandero, Logan 1.5 dCi/Blue dCi engines. Below are the real-world causes, step-by-step tests and OEM part numbers.

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P2002 quick summary

Fault codeP2002
MeaningDiesel Particulate Filter Efficiency Below Threshold – Renault/Dacia dCi
SystemPowertrain (Engine & Transmission)
VehiclesRenault / Dacia
Common on1.5 dCi K9K with DPF (about 2009 onward), 1.6 dCi R9M (Megane, Scenic, Kadjar, Trafic), Dacia Duster, Sandero, Logan 1.5 dCi/Blue dCi
SeverityMedium
Can I drive?Yes in the short term, but the engine may go into limp mode and a blocked DPF gets worse. Fix it soon.
Repair cost€0 – €1,500

Symptoms of P2002

  • 'Check particle filter' or engine warning
  • Reduced power
  • Frequent regenerations (fan running after switching off, higher idle)
  • Engine oil level rising
  • Higher fuel consumption

Most common causes of P2002 (most likely first)

Mechanic's Pro Tip

Renault dCi engines dilute the oil with diesel during regenerations, especially with short trips. Check the oil level – if it is above max, change the oil before forcing a regeneration. Many P2002 faults are caused by a faulty differential pressure sensor or a split sensor hose, so check those before condemning the filter.

  1. 1.DPF loaded with soot from short trips

    Most likely

  2. 2.Faulty differential pressure sensor or split sensor hose

  3. 3.Faulty exhaust temperature sensor

  4. 4.EGR or injector fault causing excess soot

  5. 5.Ash-loaded DPF at high mileage

Step-by-step diagnostic guide

  1. 1

    Read fault codes and soot/ash load values with CAN Clip, DDT4All or a capable scanner.

  2. 2

    Check the oil level and change the oil if it is diluted.

  3. 3

    Inspect the differential pressure sensor hoses and compare the sensor reading with the engine off (should be near zero).

  4. 4

    Check exhaust temperature sensors and look for EGR or injector faults.

  5. 5

    Do a forced regeneration with diagnostic software or a long motorway drive; replace or clean the DPF if 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

Can I clean the DPF myself?

A motorway drive or forced regeneration burns off soot. Ash cannot be burned off – a heavily loaded DPF needs professional cleaning or replacement.

Why is my oil level rising?

During regeneration extra fuel is injected and some ends up in the oil. With many interrupted regenerations the level rises and the oil must be changed.

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.