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  My van keeps cutting out - how can I fix DPF problems? 22 Apr 2023 (Ask HJ)
  My son recently purchased a Peugeot 207 diesel van. Sometimes without warning the engine dies while he is driving. If he switches it of then on the particle...
• Mazda 6 2.2d sport (2015) - DPF Malfunction warning - worth a manual regen? 22 Oct 2020 (Forum)
  So a couple of days ago I get the dreaded 'Soot Accumulation in DPF Too High' message on my 6, which has just had it's 5th birthday and done 40k. Following Mazda's helpful guidance, off for a run down the M23 I go, keeps revs between 2.5-3k. Halfway back the message turns into 'DPF Malfunction', so I presume this means the automatic regen failed.
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  Should I add a diesel additive to keep my DPF working properly? 28 Feb 2018 (Ask HJ)
  Is it worth using a DPF additive in a tank of superdiesel to keep my car's DPF clean?
• SEAT Leon - 2007 Seat Leon 1.9 DTI DPF or not? 31 Jan 2018 (Forum)
  Anything I need to look out for on this car? Ive read all the horror stories about low mileage Diesels and DPF but was under the impression that the 1.9 TDI in a 2007 Leon is pretty much the bullet proof engine thats in my Golf, is that correct? But the important question is how can I be sure it is DPF Free?
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  Ive just had the emission fix done - is it normal for the fan to run after I've turned the ignition off? 2 Mar 2017 (Ask HJ)
  Since I had the emissions fix done I've had numerous incidents of the engine or fan running on after switching off the engine and removing the key from...
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  Faulty car DPF 3 Jan 2016 (Ask HJ)
  I purchased a new diesel ASX the problem started after 8 months. Oil light stating level to high. Cars now 22 months old, done almost 16.000 miles. Same...
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  How far do I need to travel to regenerate the DPF? 27 Nov 2013 (Ask HJ)
  I have narrowed my choice of new car down to the Volkswagen Golf 1.6 TDI. I do mostly city driving, but a few times a month will go on longer journeys...
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  Why did Royal Mail buy Fiat diesel vans with DPFs? 26 Oct 2013 (Ask HJ)
  My postman tells me that Royal Mail recently took delivery of new Fiat vans fitted with diesel particulate filters. Now postal workers on suburban stop-start...
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  Long Warranty 14 May 2013 (Ask HJ)
  I was surprised when I read your reply to letters stating Honda guaranteed their new 1.6 diesel engine for 1000000 kms or 10yrs in France and Spain. They...
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  Latest DPFs - fewer problems? 18 Apr 2013 (Ask HJ)
  I was helping my father look at a new Fiat Doblo with a 1.6 Diesel engine. I mentioned to the dealer that the car would be used mainly for shorter journeys,...
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  Fuel consumption suddenly dropped? 4 Apr 2013 (Ask HJ)
  Last year my Jaguar X-Type diesel's fuel consumption suddenly dropped from 52 to 44mpg. I have put two lots of injector cleaner in the tank; changed...
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  How often do I need to take a DPF-equipped diesel for a long run? 9 Mar 2013 (Ask HJ)
  We are looking to buy a diesel estate but have had conflicting advice on how often you have to take them out for longer, faster drives to avoid problems...
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  Will my new warranty cover the DPF? 29 Jan 2013 (Ask HJ)
  My Volvo XC60 2.4D Automatic [20,000 miles] will be three years old in March. I am about to take out a two-year extended warranty with "Warranty Direct". I...
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  New Mazda6 likely to have DPF issues? 17 Aug 2012 (Ask HJ)
  I have owned a 2002 model Mazda 6 2.0 litre diesel for 96,000 miles. Never any trouble. I commute to work and use the car for business so almost every...
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  Using the right oil to prolong DPF life 16 Aug 2012 (Ask HJ)
  Please can you advise your readers to make sure the correct spec oil is being used in thier cars. I have a shiny 2012 Subaru Outback [Diesel]. Both...
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  I am thinking of buying a diesel car. either honda civic or toyota avensis dated before DPF fitted. 5 Jul 2012 (Ask HJ)
  I am thinking about buying a Honda Civic or Toyota Avensis diesel car dated before the fitting of DPF. I am concerned about the Dual Mass Flywheel and...
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  Can I remove the DPF from my Renault Laguna? 4 Jul 2012 (Ask HJ)
  I have been having problems with the DPF on a Renault Laguna diesel. I have had it regenerated twice and now someone has suggested having it taken out....
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  BMW diesel particulate filters 29 Apr 2012 (Ask HJ)
  My BMW 525 diesel ( 04/54 ) has now covered 73,000 miles mainly around town with occassional long runs and the service computer is showing 90,000 miles...
• All - DPF regen and low EGTs 2 Jan 2012 (Forum)
  With DPF now effectively mandatory on all Euro V compliant diesel engines, the problem of DPF regeneration on vehicles used predominantly for short, low speed journeys is going not going to disappear any time soon.
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  The Someday Smut 22 Apr 2011 (Ask HJ)
  Can you tell me what a particulate filter does and why and how often they need replacing?