DPF cleaning questions, answered
Short, straight answers to the questions drivers ask most about diesel particulate filters: price, warning lights, limp mode, additives, MOT rules, clean or replace, and how a mobile visit works. Each answer links to the page that covers it in full. EngiClean is rated 5.0 from more than 440 Google reviews.
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Price
How much should a DPF clean cost?
Our Premier DPF clean is from £280 + VAT (£336 inc VAT) and includes diagnostics, a chemical clean on the car and an engine carbon clean. A health check alone is from £120 + VAT. We agree the fixed price by phone from your reg. Every price is listed on our DPF cleaning cost page.
What does a diagnostic health check cost?
A diagnostic health check is from £120 + VAT (£144 inc VAT). We scan the car and read live data, so you find out whether the filter is really the problem before spending on a clean. The Premier clean includes diagnostics. The full breakdown is on the price page.
Is DPF cleaning worth it?
Often, when the filter is intact and the problem is soot. A clean costs far less than the replacement quotes customers tell us about. It won't help a cracked filter or a fault that sits elsewhere, such as a sensor. We scan first and tell you which applies. Read DPF cleaning versus replacement for how to judge it.
Can I pay for a clean in instalments?
Interest-free finance is available through EngiClean. The details are on our finance page, so you can see how it works before you commit to anything. Ring us as well and we'll agree the price for your car first, so you know the figure you'd be financing.
Warning lights and limp mode
Can you drive with a faulty diesel particulate filter?
For a short while, yes, if the light is steady orange and the car drives normally. A red light, an engine fault message or reduced power means stop and get it scanned. The RAC says a blocked filter can lead to limp-home mode. Our guide sets out what to do for each dash warning.
Will a clogged DPF cause limp mode?
Yes, it can. When the filter holds too much soot, the car cuts power to protect the engine. Driving faster won't normally clear it at that stage. A forced regeneration or an on-car clean is the usual route. We explain what to do on our DPF warning light and limp mode page.
What does it mean when the DPF light is flashing?
Handbooks differ, so check yours. Many makers use a flashing or red light to mean the filter needs attention soon, and some add an engine fault message. We treat it as a request for help and suggest a scan rather than more miles. The seven warning signs page has the rest of the symptoms.
What does P2002 mean?
P2002 is the generic code for diesel particulate filter efficiency below threshold. It points at the filter or the sensors that monitor it, and a cracked or damaged filter is one possible cause. A clean helps only if the filter is intact. See our DPF fault codes guide for P2463, P242F and the sensor codes.
Additives and DIY
Does Halfords sell DPF cleaner?
Yes. Halfords sells DPF cleaner additives and offers a workshop DPF service. We don't quote their prices, so check with them. Additives can help an early warning on a car that still drives normally. Our guide covers when a bottle helps and when it doesn't.
How do I unblock my DPF without removing it?
The usual route is a chemical clean on the car followed by a forced regeneration with diagnostic kit, which burns off the loosened soot while the car is parked. It works when the filter is intact. Ash and failed sensors need other fixes. Our guide to forced regeneration explains each step.
Can I clear a DPF code myself?
You can clear a code with a basic scanner, but it will return if the cause is still there, and the warning light on the dash is checked at an MOT. Clearing it hides the symptom without fixing the filter, sensor or soot level. Find out what each code means in our fault codes guide.
How often should you clean the DPF?
There is no fixed mileage. A filter on a car that does regular motorway runs may never need a clean, while one used mostly for short trips can clog sooner. The RAC and AA both link blockages to short journeys. Our guide on preventing a blocked DPF covers what helps.
Clean or replace
Is it worth replacing a DPF?
Only if the filter is physically damaged, such as cracked or melted, or a clean has been tried and failed. Many blocked filters are just full of soot and respond to a clean. Customers have told us garages quoted replacement first. Compare the options on our cleaning versus replacement page.
Can a clean fix a filter a garage said needed replacing?
Sometimes. A customer's review says a garage advised removal or replacement, and the filter was then cleared off on the car, with scans before and after. We can't promise that for every filter. The scan decides it, and we'll say plainly if a clean won't work. See cleaning versus replacement.
Will a DPF clean fix P2463?
P2463 is the soot accumulation code, so a clean followed by a regeneration is the sensible first step when the filter is intact. If the code returns quickly, something upstream may be producing excess soot, such as the EGR or fuel system. The fault codes guide gives a table of what each code needs.
What if the filter blocks again after a clean?
The Premier clean carries a 3-month re-blocking warranty, subject to driving conditions and following our advice. If the filter blocks again, ring us and we'll look at why. The terms are on our price page and in our terms and conditions.
MOT, deletes and emission zones
Can I still pass my MOT with the DPF removed?
No. The MOT inspection manual treats a DPF that has been tampered with, or emission equipment that is missing, as a major defect. Removing a filter is illegal for road use, and we never do deletes. Our page on DPF and MOT rules explains what testers check.
Will a dashboard warning light fail an MOT?
It can. The MOT manual makes an engine warning light that is inoperative or showing a malfunction a major defect on a diesel car, and visible smoke from a DPF-fitted exhaust is also a major defect. Fixing the cause before the test is the safer route. See DPF and MOT rules.
Is it legal to remove a DPF?
No, not for road use. Removing it is illegal and fails the MOT, and the AA warns it could affect your insurance. We never remove or delete filters. We clean them and leave them fitted. The MOT rules page sets out what the test looks for.
Do low emission zones affect diesel cars with a DPF?
Zone rules depend on the zone and your car's registered emissions standard, so check your registration on the official zone checker before travelling. A working filter keeps you legal on the road in any case. Our guide covers the low emission zones that matter to diesel drivers.
The visit
How long does a DPF clean take?
About an hour is typical. Customers describe roughly an hour in total and, on other vehicles, 90 minutes. A badly blocked filter or an extra fault found during the scan can add time. We'll give you a realistic idea when we agree the price. See the price page.
Do you come to me?
Yes. We come to you, so the clean happens on your driveway or at your workplace, and the visit usually takes about an hour. We have five engineer bases: two in the Glasgow area (including our Cambuslang unit), one in Edinburgh and two in the Newcastle area. Check the coverage page for your area.
How quickly can you get here?
Same-day or next-day visits are common in and around Glasgow. Elsewhere, we can often have an engineer with you the same day too. The coverage page lists the areas we work in, including Edinburgh, Fife and the north east of England.
What happens during a forced regeneration?
After a chemical clean, we start a regeneration with diagnostic equipment while the car is parked. The exhaust gets hot and the loosened soot burns off while we watch live readings. We then clear fault codes and take post-clean readings. Our forced regeneration guide explains it in full.
Carbon, GPF, ADAS and remap
Is engine carbon cleaning worth it?
It can be, particularly on an engine with carbon build-up affecting running. It is a separate job from the DPF clean, though we include a carbon clean in the Premier clean. Our guide weighs up whether engine carbon cleaning is worth it and when it isn't.
Do petrol cars have a particulate filter?
Some newer petrol cars do, and it is called a GPF. We clean those too, and the service is covered on our GPF cleaning page. If you aren't sure whether your car has one, ring with the reg and we'll check.
Do I need ADAS calibration after a windscreen replacement?
Often, if your car has a camera behind the windscreen, because the camera's view changes when the glass does. The car maker's procedure decides whether yours needs it, and it is worth asking before the glass is fitted so the calibration can be planned. Our guide covers ADAS calibration after windscreen replacement.
Do you do mobile ECU remaps?
Yes, we offer mobile ECU remapping as well as DPF work. Ring with your reg and we'll talk through what suits the car, what doesn't, and how it fits alongside any DPF or carbon work. Find the details on our mobile ECU remap page.
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