Diesel Particulate Filter

Service

BMW & Mini - Diesel Particulate Filter DPF

A DPF is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine.

Why do we need a DPF?

For vehicle manufacturers to meet strict European emissions legislation, the DPF reduces exhaust smoke and black soot, significantly reducing emissions thereby protecting the environment.

How does it work?

DPF’s or ‘traps’ simply do that, they catch particles of soot in the exhaust. As with any filter, they must be emptied to allow them to maintain performance. The process of cleaning the filter is known as ‘regeneration’.

How long does a DPF last?

DPF’s are designed to last in excess of 100 000 miles. If the vehicle is operated correctly, the DPF may well exceed this mileage.

Why does the DPF need regeneration/cleaning?

The DPF traps soot particles as they pass through the monolith and like any filter, this must be regenerated or cleaned to restore it to full operation. Under normal operation this process is carried out by the car itself (passive regeneration). However, cars used mainly for short journeys do not provide sufficient opportunity to regenerate the DPF – this can result in an engine warning light and/or lack of power.

What happens if my DPF warning light comes on?

The DPF warning light normally comes on when the back pressures in the exhaust exceed a predetermined limit indicating the exhaust is starting to block up. Once this light has come on, there will be a fault code stored in the engine management which will prevent ‘passive regeneration’. At this stage, the vehicle requires a ‘forced regeneration’ which can only be carried out in the workshop with specialist BMW diagnostic equipment. A ‘forced regeneration’ uses the diagnostic equipment to initiate the DPF regeneration and subsequently operate the car at load (providing there are no other engine faults).

What if I don’t have the DPF regenerated?

Failure to have the regeneration completed would result in the filter becoming blocked further. The engine will lose power and the filter may be beyond repair and require replacement which can be costly.

How long does the regeneration process take?

The DPF can take approximately an hour and a half to complete.

How can I prevent the DPF from becoming blocked?

Vehicles fitted with DPF’s require frequent motorway journeys lasting at least half an hour in a lower gear to increase exhaust temperature.

We are located in Stockport, just off the main A6, and 2 mins from J1 or J27 of the M60.

Call 0161 429 8331

Please call us to book in or discuss your vehicle. We are more than happy to discuss any questions you may have.

Professional and customer focused service from qualified senior BMW technicians with over 20 years joint experience.

DISCLAIMER

BM MotorWorks Ltd are NOT an official BMW franchise, dealer or affiliated with BMW UK.

We are an independent limited company who prefer to offer our services to private BMW owners and drivers. people, and the planet.

Our Qualifications

At BmMotorWorks, we take great pride in our extensive training and experience within the BMW and MINI network, enabling us to provide you with a truly first-class service.

BMW training courses up to 2025
Level 3 or level 3&4 EV trained
BMW Senior Technician certificate(s)
BMW Service Technician certificate(s)
BTEC National
City and Guilds
BTEC First
BMW apprenticeship certificate
F gas certified air conditioning handlers

      EXCELLENT  
   Based on 191 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Ashley masterson 
 October 20, 2025
 
 
 Trustindex verifies that the original source of the review is Google. Fantastic Garage - Knowledgeable & Friendly Mechanics - Had a issue with my brakes, upon diagnostic and repair, the car feels brand new, and definitely feel safe driving it again. Thanks guys.
  
 
      Posted on Google  
   
   Jay Merc 
 August 15, 2025
 
 
 Trustindex verifies that the original source of the review is Google. Highly recommend these Mini and BMW specialists to anyone 👍
  
 
      Posted on Google  
   
   Brian Chapman 
 August 14, 2025
 
 
 Trustindex verifies that the original source of the review is Google. They have been looking after my X3 for 4 years and I have always had excellent service. Today it went in to have a rattle that seemed to be coming from the glove box at certain speeds I'm delighted to say that Phil managed to find it - a loose commector on a fuel pipe in the engine compartment. Great service again from Gareth and his team.
  
 
      Posted on Google  
   
   Jon Hadfield 
 July 30, 2025
 
 
 Trustindex verifies that the original source of the review is Google. Went in with an air- conditioning fault. Despite not being a BMW, the lads at BMworks diagnosed and rectified the issue within a morning. Collected car and had ice cold air-con. Very satisfied.
  
 
      Posted on Google  
   
   Stacey Rowley 
 July 15, 2025
 
 
 Trustindex verifies that the original source of the review is Google. Took my Mini Cooper S yesterday for a Transmission oil change, due to a “Drive Train” fault that appeared. Excellent,  Honest Service. Very impressed and will use again. Would certainly recommend.
  
 
      Posted on Google  
   
   Qasim Ali 
 July 4, 2025
 
 
 Trustindex verifies that the original source of the review is Google. I've brought my Mini on multiple  occasions now, and each time they've proven to be honest, trustworthy, and highly skilled. After initially going to the Mini main dealer who completely missed a thermostat housing issue these guys diagnosed and resolved it quickly and efficiently. Their pricing is very reasonable, and they communicate clearly and professionally throughout.  Highly recommended for any MINI or BMW owner looking for quality service.
  
 
      Posted on Google  
   
   Aliss McGregor 
 June 23, 2025
 
 
 Trustindex verifies that the original source of the review is Google. Williams wanted to charge £160 quid to just diagnose a well known fault (ev mini cooper - charging flap open). Bmworks replaced the entire housing same day, for £106 . Lovely guys, very happy.
  
 
      Posted on Google  
   
   Dave Dutton 
 June 21, 2025
 
 
 Trustindex verifies that the original source of the review is Google. Very accommodating and professional service.
  
 
      Posted on Google  
   
   Simon Reuben 
 May 26, 2025
 
 
 Trustindex verifies that the original source of the review is Google. I was told by another independent garage that my mini required a new gearbox or clutch because of the smell it had after being driven recently By one of the driversand I went along to BM motor Works and one of the team there took a look ran some diagnostics and told me there was nothing wrong with the clutch that someone had probably been riding the clutch and it did not require any attention.to the car.  No charge. I was genuinely blown away by the professionalism service and helpfulness. I’ll be using them for all BMW and mini related issues And have no hesitation in recommending them.
  
 
      Posted on Google  
   
   Michael Jordan 
 May 15, 2025
 
 
 Trustindex verifies that the original source of the review is Google. Can't recommend these guys enough. After getting a ridiculous quote from bmw directly for a starter motor and new battery, I spoke to these guys who did a better job at a 3rd of the cost. They also fixed a loose parking sensor that I didn't ask about. Bmw also wanted to charge me £150 just to look at it. Excellent job, couldn't be happier!

Our Promise & Values

" Our aim is to provide a first class service at all times, to each and every one of our customers. We adopt a totally customer focused approach to ensure every customer feels assured and confident to entrust the servicing and maintenance of their vehicle with us "

Gareth Hutton

Contact Us

Book your vehicle in or send an enquiry…

Common Questions

1. Do you offer a 'while you wait' service?

At BmMotorWorks, we are pleased to offer a while you wait service (depending on the nature of the service). This service requires a pre-arranged appointment and you can then enjoy a hot/cold beverage and comfortable seating in our warm and clean reception waiting area.

2. Do you offer free collect & delivery?

Depending on your location and our workload we can collect and deliver from your home or place of work - please call us for availability.

3. What are your opening hours?

Monday: 08.30-17.30

Tuesday: 08.30-17.30

Wednesday: 08.30-17.30

Thursday: 08.30-17.30

Friday: 08.30-17.30

Saturday: CLOSED

Sunday: CLOSED