Ask Honest John

Most recently answered diesel particulate filter questions
Ford Focus 09 1.8TDCi hatchback. Has this model got a DMF?
I want to buy 1.6 HDi C3 Picasso, 10 plate. I do under 5K per year. Is that going to be a problem?
I do 15,000 miles a year, daily 15 or less round trips, with 70 mile runs about once a fortnight and longer holiday runs. I have run a Mercedes C220 CDI auto for 9 years, now on 135,00 miles and now considering...
I have been worried by your frequent references to costly problems relating to diesel car particulate filters. We have a 2 year old Subaru Legacy with the 2.0 diesel engine. I have asked our garage about...
I am contemplating swapping my trusty 04 plate Honda Accord Tourer 2.0EX petrol for either a 58 or 09 plate Accord Tourer diesel or Mazda 6 Estate diesel. But what about DPF and DMF problems which seem...
I'm considering buying a large car possibly a 2007 / 2008 new shape Honda CRV i-CTDI. One company owned from auction with 100k+ on clock. I am concerned about DPF on new diesel cars, though, as I do...
I want to replace my Renault Grand Scenic, which I've never really liked, and have looked at a 57 plate Citroen C4 Picasso 5 seater 1.6 diesel auto. Inside it's great - loads of room for three kids. However,...
As the owner of a 2011 520D BMW touring automatic I only do about 5000 miles a year mainly City driving. I see advertisements for removal of DPF, is this a solution to avoid impending major problems?
In your summary of the Volvo V50 you state as a 'bad point' that diesels are expensive after 3 years. I have a 40 month old Volvo V50 2.0 diesel with 22k miles and and no problems so far. I need to decide...
Flashing DPF dasboard light came on at 23400 miles on 15/02/12. Mazda dealer diagnostic check showed that they had not reset the car computer(?) after the service in July 11, no actual fault with DPF....
 

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