Why it happens
Short trips, idling and stop-start driving do not get the exhaust hot enough for the filter to clean itself (regenerate).
What you can try
If the handbook allows, a steady 20 to 30 minute drive at motorway speed can let it regenerate. Follow the handbook instructions.
When it needs a workshop
If the light stays on, flashes, or the car goes into limp mode, a forced regeneration with a scan tool, a sensor repair or a filter clean may be needed.
What to tell the mechanic
Your typical driving, any other warning lights, limp mode, and whether a regeneration has been tried.
Safe to drive?
Light on but the car drives normally: try a longer run if the handbook says so and book in if it stays on. Limp mode or a flashing light: book in promptly.
General guidance only, not a diagnosis. If in doubt, do not drive it and have it inspected. In an emergency, call 111.
Who can help
Get quotes for diesel mechanic near you
Questions
Can I remove the DPF?
No. Removing or disabling it is illegal for road vehicles in New Zealand and fails a WOF or COF.
What should I put in the job?
Make, model, the warning lights and your usual driving.