Symonis DPFBRENT CROSS · NW9

Mon–Fri 8:30–17:30 · Sat 9:00–13:00

07973 102966
A diesel SUV with its bonnet up in the Symonis workshop bay

DPF Cleaning
North London

Fixed prices from £69 — agreed before any work starts

  • Drive in or book a slot
  • While-you-wait cleans
  • Removed, cleaned & refitted
  • Bring your car or just the DPF

Diagnostic first, every time. If a clean isn’t the right fix, we’ll tell you straight, including the fix that costs nothing.

Get my fixed price

Send your details. We call back fast with a fixed quote.

No spam, no obligation. Or just call — it’s quicker.

The wash process

Watch what actually happens to your filter

Close-up of a technician working on a diesel engine, the poster frame for the wash process video

Removed from the car, machine-washed, flow-tested, refitted. No smoke and mirrors: this is the whole job.

Three ways to fix a blocked DPF

An honest ladder: each step does more and lasts longer. We’ll tell you which one your car actually needs after the diagnostic, not before.

Regen clean

from £69

  • Diagnostic scan + forced regeneration
  • Clears soot
  • Ash stays in the filter
  • Only possible if no other faults stored
Soot only Temporary

In-situ deep clean

from £180

  • Cleaning solution through the filter, on the car
  • Deeper than a regen
  • DPF not removed, so ash remains
  • Warranty up to 6 months / 6,000 miles
Ash remains

A fraction of the £1,000+ a new DPF costs at a dealer. Every price is fixed and agreed with you before any work starts. Prices shown are “from”: the exact fixed quote depends on your vehicle.

Ash is the argument

Cleans shift soot.
Only an off-car refurb removes ash.

Soot is unburnt carbon — every clean on the ladder can shift it, and your car’s own regeneration burns it off when it gets the chance.

Ash is what’s left after soot burns. It’s mineral. It cannot be burnt off, flushed through, or foamed out on the car — it packs the filter cell by cell until no clean works any more. The only way ash leaves a DPF is off the car, in the wash rig.

Typical job report — back-pressure before

187 mbar · blocked

After off-car refurbishment

12 mbar · as-new flow

Every refurbished filter leaves with its own before/after readings: your proof it worked, on paper.

How it works

  1. Drive in, or drop the unit

    Bring the car to Brent Cross, or bring just the DPF if it’s already off. Workshops welcome. Easy parking on the estate.

  2. Diagnostic first

    Full scan before anything else. If the real fault is a sensor, the turbo, or something a clean won’t fix, you find out before you spend a penny on cleaning.

  3. The right clean, proven

    Regen, in-situ clean, or full off-car refurbishment. Fixed price agreed first, road-tested after, readings on paper.

Sound familiar?

If your dashboard or your right foot is telling you any of this, the DPF is the usual suspect.

  • DPF warning light onThe amber filter symbol: soot load past the limit.
  • Stuck in limp modePower capped to protect the engine. Drive it in, carefully.
  • “Exhaust Filter” messageFord and VW dashboards call the DPF the exhaust filter — same thing.
  • “Anti Pollution Fault”Peugeot/Citroën’s way of saying the same thing.
  • Down on power, up on fuelA choked filter makes the engine work against itself.
  • Short-trip drivingSchool runs and the North Circular crawl never get the filter hot enough to self-clean.

“Should I just get a mobile DPF clean?”

Honest answer: it’s a temporary fix at best. If your car qualifies for one, you might not need to pay anyone at all.

A mobile clean is a forced regeneration or foam clean done at your door. It can shift soot; it cannot remove ash, and the filter keeps its old age. If the car has no other faults and the oil is right, an hour of steady motorway driving can do the same job for free. We wrote the whole thing up, including the checks that decide it:

Read the honest guide to mobile DPF cleaning

Find us — Brent Cross, NW9

Symonis DPF
Unit C3, Connaught Business Centre,
Hyde Estate Road, London NW9 6JL
Hours
Mon–Fri 8:30–17:30 · Sat 9:00–13:00
Parking
Free on the estate, right outside the unit
Phone
07973 102966
From the A5
2 minutes from the Hyde; 5 minutes from Brent Cross flyover

Serving all of North & NW London: Hendon, Cricklewood, Golders Green, Finchley, Wembley, Harrow, Barnet, Edgware — plus Watford and Herts.

Straight answers

How long does a DPF clean take?

A regen or in-situ clean is usually done while you wait — around two hours. A full off-car refurbishment takes longer because the filter is removed, machine-washed, dried and flow-tested; most are same-day or next-day. We’ll give you the honest turnaround with your fixed quote.

Refurbish or replace?

Caught early, a clean is usually enough. Badly blocked or ash-loaded filters can almost always be refurbished off-car for a fraction of the £1,000+ a new filter costs at a dealer. Refurbishment restores as-new flow, so you’re not buying new for the sake of it.

What’s the difference between soot and ash?

Soot is unburnt carbon — cleans and regenerations shift it. Ash is the mineral residue left after soot burns; it can’t be burnt or flushed out on the car. Ash is why filters “keep blocking” after mobile cleans, and why the off-car wash is the only clean that resets the filter properly.

Does mobile DPF cleaning work?

At best it’s a temporary fix: it can clear soot but never ash, it needs the car to have no other stored faults (the ECU locks out forced regeneration otherwise), and the filter keeps its old age. We wrote an honest full guide here, including the free motorway alternative.

Can I just drive it on the motorway to clear it?

Sometimes, yes. And we’d rather tell you that than sell you something you don’t need. If there are no other fault codes and your oil level is correct, roughly an hour at a steady 65mph without stop-starts can achieve the same as a forced regeneration. If the light comes back, the blockage is beyond soot — that’s when to call us.

Can you remove or delete my DPF?

No. Removing a DPF for road use is illegal and an instant MOT failure. We remove filters to clean and refit them — never to delete them.

Can you force a regeneration?

Only when it’s safe. A forced regen on a badly blocked filter or with contaminated oil can damage the engine and turbo. So we diagnose first, check the oil, and only regen when it’s the right fix. That’s also why it’s the cheapest rung on our ladder, not a miracle cure.

Do I have to bring the car?

No — if the filter’s already off, bring just the unit and we’ll deep-clean, flow-test and return it. Workshops do this with us all the time; there’s a trade service with its own pricing.

How do I pay?

Card, bank transfer or cash, when the work’s done. The price you pay is the fixed price we agreed before starting — no extras invented mid-job.

Light on? Let’s get it off.

Fixed price agreed first. Diagnostic-led. Drive in today.