201 King Street, Fenton, Stoke-on-Trent ST4 3ER
Open Mon–Sat 9am–6pm · Closed Sunday
Home › FAQs
Open Monday to Saturday · Fenton, Stoke-on-Trent
Straight answers on DPF cleaning, forced regens, prices and postal cleaning, plus EGR, carbon and lambda sensor cleaning. Can’t see your question? Call or WhatsApp us.
On-car DPF clean from £200
Same-day slots, space permitting
Visits by appointment
Postal cleaning UK-wide
DPF cleaning
How cleaning and forced regens work. See DPF cleaning and regeneration.
What’s the difference between a DPF clean and a forced regen?
A forced regen raises the exhaust temperature to burn off loose soot, but it can’t remove hardened ash. A full clean uses a chemical flush to break down the soot and ash first, then a controlled regen to burn off what’s left.
How do I know the filter needs cleaning, not replacing?
We check the back-pressure and soot readings and look for damage first. If the filter isn’t cracked or melted, a clean usually restores flow for much less than a new filter.
Does a workshop DPF clean really work?
Yes. We take readings before and after, so you can see the soot load and back-pressure come down rather than just the warning light going off.
Can I clean my DPF myself?
Additives and DIY methods can help a lightly loaded filter, but they rarely shift a badly blocked one, and some can contaminate the sensors. See whether DPF additives work. If the light keeps coming back, the filter needs a proper clean.
Is DPF cleaning safe for the sensors and turbo?
Yes. We monitor exhaust temperature and pressure throughout the regeneration, and nothing is cut or welded.
How often should a DPF be cleaned?
It depends on how the vehicle is driven. Mostly motorway miles can keep a DPF healthy for a long time, while town vans may need attention every 25,000–40,000 miles.
Will a clean help me pass the MOT?
A blocked DPF can push smoke readings over the limit and fail the MOT. Cleaning brings the readings back down, so it’s worth doing before the test if the DPF light has been on.
Do you reset the DPF counter?
Yes. Once the filter is flowing properly, we reset the DPF adaptation values so the ECU knows it’s clear.
Booking and prices
What it costs, how long it takes and how to book.
How much does it cost?
On-car DPF cleaning starts from £200, EGR valve cleaning from £120, engine carbon cleaning from £100 and lambda sensor cleaning from £80. Off-car and postal DPF cleaning are priced on quote. Prices shown are starting prices. The final price depends on many factors, including the vehicle and how complex the job is, and we confirm it before any work starts.
How long does it take?
Most on-car DPF cleans take 60–90 minutes, but we’ll give you a time when you book. For everything else, including off-car cleans, we’ll give you a time when you book.
Can I wait while it’s done?
For an on-car DPF clean, yes, you’re welcome to wait.
Can I be seen the same day?
Often, yes. Same-day slots are available when we have space.
Do I need an appointment?
Yes. Visits to our Fenton workshop are by appointment, so get in touch first. We’re open Monday to Saturday 9am–6pm, closed Sunday.
Do you offer a mobile service?
No. All our work is done at our Fenton workshop in Stoke-on-Trent, where we have the equipment to diagnose the fault and check the results properly. We’re open Monday to Saturday, with same-day slots when there’s space.
How does postal DPF cleaning work?
Get in touch first so we can check it suits your filter. Then remove the DPF, pack it securely with your name, phone number and reg, and post it to 201 King Street, Fenton, Stoke-on-Trent ST4 3ER. We clean and test it and send it back ready to refit.
How much does it cost, and how long does it take?
Postal cleaning is priced on quote. The price and how long it takes to get back to you depend on the filter and where you are, so we’ll confirm both when you get in touch.
Can I send several filters at once?
Yes. Garages and traders often send several together. Just let us know what’s in the box.
What if my DPF is damaged?
We inspect every filter before cleaning. If the core is cracked or melted, we’ll contact you before going any further.
What does an EGR valve do?
It feeds a small amount of exhaust gas back into the intake to lower combustion temperatures and NOx. Carbon builds up on it over time and makes it stick.
What are the signs of a sticking EGR valve?
Rough idle, flat spots, higher fuel use and fault codes such as P0400, P0401 or P0402.
Is removing and cleaning better than a spray?
Yes. Sprays can loosen light deposits, but hardened carbon needs the valve off to be soaked and scrubbed.
How much does EGR cleaning cost?
EGR valve cleaning starts from £120. Prices shown are starting prices. The final price depends on many factors, including the vehicle and how complex the job is, and we confirm it before any work starts. It’s usually much less than a new electronic valve.
What is engine carbon cleaning?
Our hydrogen machine feeds gas into the air intake while the engine runs, breaking down carbon on the valves, injectors and EGR passages without dismantling anything or adding chemicals to the fuel.
Does it work?
When carbon build-up is the problem, you’ll often notice a smoother idle, fewer flat spots and lower emissions. It won’t fix every fault, which is why we check the vehicle first.
Is it safe?
Yes. No abrasives or acidic cleaners are used, no parts are removed, and the engine burns the softened deposits away at a controlled temperature.
How often is it needed?
Every 15,000 to 25,000 miles is a sensible guide, and sooner if you mainly drive in town or idle a lot.
How much does carbon cleaning cost?
Engine carbon cleaning starts from £100. Prices shown are starting prices. The final price depends on many factors, including the vehicle and how complex the job is, and we confirm it before any work starts.
What does a lambda sensor do?
It measures the oxygen in the exhaust so the ECU can keep the air-fuel mix right.
When does it need cleaning rather than replacing?
If it’s switching slowly or throwing codes such as P0130 or P0171 after short trips, a clean usually helps. A broken heater circuit or open-circuit fault needs a new sensor.
Is cleaning a lambda sensor safe?
Yes, when it’s done off the engine with an oxygen-safe decarboniser. We don’t use acids or wire brushes.
How much does lambda sensor cleaning cost?
Lambda sensor cleaning starts from £80. Prices shown are starting prices. The final price depends on many factors, including the vehicle and how complex the job is, and we confirm it before any work starts. It’s usually much less than a quality replacement sensor.
Remaps and AdBlue
Handled by our sister companies.
Do you do ECU remapping?
Remapping is done by our sister company Pro Remapping, from the same Fenton workshop.
Do you fix AdBlue faults?
AdBlue and NOx faults are handled by our sister company AdBlue Specialist.
Call or WhatsApp us with the reg and what the car is doing, and we’ll give you a straight answer.
201 King Street, Fenton, Stoke-on-Trent ST4 3ER · Open Mon–Sat 9am–6pm, closed Sunday · Visits by appointment