Exhaust
What is a Diesel Particulate Filter (DPF)?
Traps soot from diesel exhaust so it doesn't reach the air.
Simplified animation — not to scale.
In plain English
Found on modern diesels, the DPF is a fine filter in the exhaust that catches soot particles. It periodically burns them off in a process called 'regeneration'.
A simple analogy
"A self-cleaning oven — gets hot enough to burn off the gunk inside."
How it works
Exhaust gas flows through tiny channels; soot sticks to the walls. When the filter is full, the engine raises exhaust temperatures to burn the soot to ash.
Signs of trouble
- ⚠DPF warning light
- ⚠Loss of power / limp mode
- ⚠Strong smell of diesel
- ⚠Frequent short journeys (filter can't regenerate)
Rough UK cost
£300 cleaning – £2,000+ replacement
Always get a written quote. Prices vary by car, region, and parts brand.
Heads up: Carautonomy is for general guidance only. If your car is showing warning lights or behaving oddly, get it looked at by a qualified mechanic.