The diesel particulate filter (DPF) traps the soot a diesel engine produces so it is not released into the air. Over time that soot builds up, and if the filter cannot clear itself the car will start to complain. Here is how to spot a blocked DPF, what it costs to have one professionally cleaned, and when cleaning is the smarter option than a costly replacement.
What does a DPF do?
Every modern diesel has a DPF fitted in the exhaust. It captures fine soot particles and periodically burns them off in a process called regeneration, which needs a good run at motorway speed to reach the required temperature. Lots of short, stop-start town journeys never let that happen, which is the most common reason filters clog up.
Signs of a blocked DPF
Watch for these warning signs:
- DPF warning light on the dashboard that stays on.
- Noticeable loss of power, or the car dropping into limp mode.
- A strong smell of diesel or excessive smoke from the exhaust.
- Higher fuel consumption than usual.
- Failed or repeated regeneration messages on the dash.
- The engine start-stop system switching itself off.
If the light comes on and stays on, the filter is not regenerating. Continuing to drive risks damage not just to the DPF but to the turbo, so it is best to get it checked quickly.
How much does DPF cleaning cost?
Professional DPF cleaning is far cheaper than a replacement filter, which from a main dealer can run into four figures. The exact price depends on the vehicle and how blocked the filter is, so the fair thing is to diagnose it first and give you a clear quote. Our DPF cleaning starts from an affordable fixed price and we can usually turn it around the same day.
Cleaning vs replacement
In most cases a clogged filter can be cleaned and returned to near-original efficiency for a fraction of the cost of a new one. Replacement is only necessary when a filter is physically damaged or has been left blocked for too long. We will always tell you honestly which route your car needs rather than reaching for the most expensive option.
How to avoid a blocked DPF
- Give the car a longer, faster run (20 to 30 minutes at motorway speed) regularly so it can regenerate.
- Use good-quality fuel and the correct low-ash engine oil.
- Do not ignore the DPF light: the sooner it is dealt with, the cheaper the fix.
Car City Care is one of the highest-rated DPF specialists in North London, with the equipment and experience to diagnose and clean your filter the same day. Learn more about our DPF cleaning service, or get in touch for a quote.
