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EmissionsSeverity Medium: diagnose soon

P2002Diesel Particulate Filter Efficiency Below Threshold (Bank 1)

What it means

The ECU believes the particulate filter is not trapping soot as it should: the pressure difference across it is too low for the conditions. The filter may be cracked, or the measurement is wrong.

Symptoms

  • Check engine light
  • Possibly soot at the tailpipe
  • Usually no loss of power

Common causes

  • Cracked or damaged DPF
  • Split or disconnected differential pressure sensor hose
  • Faulty differential pressure sensor
  • DPF removed or hollowed out

What to check first

  1. Check DPF differential pressure at idle and at 3,000 rpm
  2. Inspect both sensor hoses for splits and correct routing
  3. Look for soot downstream of the DPF
Can I drive with P2002? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.
Practise it: Clogged particulate filter (diesel) in the engine simulator shows this fault in live data, tests and on the scope.Open in the simulator

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

Known engine problems that set P2002

2.0 TDI EA189: Blocked particulate filter (DPF)Volkswagen, Audi, Skoda, Seat · typically 80,000–200,000 km1.6 TDI EA189: Particulate filter clogging in town useVolkswagen, Audi, Skoda, Seat · typically 60,000–180,000 km1.5 dCi K9K: Particulate filter and oil level risingRenault, Dacia, Nissan, Mercedes-Benz, Suzuki · typically 60,000–200,000 km1.6 HDi/TDCi DV6: Particulate filter additive running outPeugeot, Citroën, Ford, Volvo, Mazda, Mini · typically 80,000–200,000 km1.3 Multijet/CDTI: Oil level rising (diesel in the oil)Fiat, Opel, Suzuki, Ford, Lancia, Alfa Romeo, Peugeot, Citroën · typically 40,000–160,000 kmMazda 2.2 diesel: Oil level rising from diesel dilutionMazda · typically 30,000–150,000 km

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P2002: questions and answers

What does P2002 mean?

P2002: Diesel Particulate Filter Efficiency Below Threshold (Bank 1). The ECU believes the particulate filter is not trapping soot as it should: the pressure difference across it is too low for the conditions. The filter may be cracked, or the measurement is wrong.

What are the symptoms of P2002?

Check engine light. Possibly soot at the tailpipe. Usually no loss of power.

What causes P2002?

Cracked or damaged DPF. Split or disconnected differential pressure sensor hose. Faulty differential pressure sensor. DPF removed or hollowed out.

How do you diagnose P2002?

1. Check DPF differential pressure at idle and at 3,000 rpm 2. Inspect both sensor hoses for splits and correct routing 3. Look for soot downstream of the DPF

Can I drive with P2002?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.