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BMW B47 (B47D20 / B47C20)Urgency: Garage soon

Particulate filter warning light (DPF) in the BMW B47 engine: causes

In the BMW B47 engine, 1 documented fault may be the cause: particulate filter (DPF) clogging in urban use.[1]

What to do now

Garage soon

If the handbook allows it, a 20-minute drive on a motorway at a steady speed can complete the regeneration. If the light stays on or you lose power, go to a garage.

What it means

On modern diesels it means the particulate filter is clogged with soot and has not been able to regenerate. It is common in cars used mostly for short town journeys, although it can also be caused by a sensor or by an injection or EGR fault.

DPF warning light: causes in all cars

11 sourcesHow we work

Engine faults that cause it

From most to least important. Under each fault, how the symptom shows up. Check the affected years and versions on each page.

  1. Source for the symptom[1]

How much it can cost

Depending on the cause, repair at an independent garage ranges from €500[2] (particulate filter (DPF) clogging in urban use) to €1,800[2] (particulate filter (DPF) clogging in urban use), including VAT.

Most serious fault among the possible causes: Medium severity

Other common causes: DPF warning light

Besides the documented faults of the BMW B47, these are the most common causes on any car according to the sources.

  • Short journeys and almost purely urban use[3][4][5][6]Common
  • Interrupted regenerations (switching the car off midway)[3][4][5]Common
  • Accumulated ash or a filter near the end of its life[4][5][7][8]Possible
  • DPF additive used up (cars with an additive system)[5][9]Possible
  • Faulty differential pressure sensor or other sensors[5][10]Possible
  • Faults that prevent regeneration: EGR, injectors or leaks[10]Possible

What to check first

  1. Note whether the light is steady or flashing and whether the car loses power or goes into limp mode: a flashing light or one that does not go out is a reason to go to the garage immediately.[5][11]
  2. If you notice signs of regeneration (a fan that keeps running after switching off, higher idle, a different exhaust sound, Start/Stop disabled), do not switch the car off: carry on for about 15 or 20 minutes on a main road.[3][11]
  3. Get onto a main road and drive for a while at 2,300-2,500 rpm in a lower gear than usual. Do not try to open or clean the filter yourself.[3]
  4. If the light stays on, ask a garage for a forced regeneration with a diagnostic scanner and have them read the fault codes to rule out sensors, EGR or injectors.[3][4][10]
Complete guide: particulate filter warning light (DPF)

Cars with the BMW B47 engine

Open yours to see only the faults that affect it according to its years and versions.

Frequently asked questions

DPF warning light in the BMW B47: what could it be?

In the BMW B47 engine, 1 documented fault may be the cause: particulate filter (DPF) clogging in urban use. Each fault has its own page with the affected years and versions, the cause and how to check for it.

DPF warning light in the BMW B47: is it serious?

Urgency: garage soon. If the handbook allows it, a 20-minute drive on a motorway at a steady speed can complete the regeneration. If the light stays on or you lose power, go to a garage. The most serious fault that causes it on this engine has medium severity.

DPF warning light in the BMW B47: how much does it cost to fix?

It depends on the cause: at an independent garage, from €500 (particulate filter (DPF) clogging in urban use) to €1,800 (particulate filter (DPF) clogging in urban use), including VAT.

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. BMW B47 Engine Guide: Reliability, Efficiency, Tuning, Pros and ConsBMW BLOG · Other source · published August 2025 · consulted 26 September 2026
  2. Motor BMW B47: problemas, modelos y qué revisarCarexam · Motoring press · consulted 26 September 2026 · in Spanish
  3. ¿Qué es el filtro de partículas y para qué sirve?RACE · Motoring press · published 26 January 2021 · consulted 4 October 2026 · in Spanish
  4. Síntomas de un filtro de partículas obstruido: señales y soluciones para evitar averías y fallosAutopista · Motoring press · published 12 September 2025 · consulted 4 October 2026 · in Spanish
  5. El sistema DPF (Filtro de Partículas Diésel) - Boletín InformativoHELLA · Manufacturer · published 2015 · consulted 4 October 2026 · in Spanish
  6. P2463 Fault Code Definition & InfoThe Automotive Technician (TaT) · Technical documentation · consulted 4 October 2026
  7. El filtro de partículas de mi coche no funciona, ¿qué puedo hacer?Diariomotor · Motoring press · published 21 November 2020 · consulted 4 October 2026 · in Spanish
  8. P242F Fault Code Definition & InfoThe Automotive Technician (TaT) · Technical documentation · consulted 4 October 2026
  9. ¿Para qué sirve el aditivo del filtro de partículas de mi coche diésel?Diariomotor · Motoring press · consulted 4 October 2026 · in Spanish
  10. ¿Te falla el sistema antipolución de tu coche?RACE · Motoring press · published 25 September 2026 · consulted 4 October 2026 · in Spanish
  11. Filtro de partículas: la guía definitiva para entender su regeneración y evitar averías costosasAutopista · Motoring press · published 8 June 2026 · consulted 4 October 2026 · in Spanish