Ask Honest John

Most recently answered diesel particulate filter questions
I am thinking of buying a Mazda CX5 Sport diesel ex demo but have read that in Australia there have been problems with DPFs & oil levels over the X mark? Do you know of any problems regarding this? Not...
I have just acquired a Citroen C8 and a warning came up on the panel that the diesel additive needed attention, and to get a local dealer to look at it.
I am interested in buying a new-ish Vauxhall Corsa around 2006-early 2008. When did DPFs get introduced on these cars?
My Focus 1.6TDCI 110 will be coming up to 75,000 miles in a few months. I understand that replacement of the DPF is reccomended by the manufacturer at this point. Given the price of it, is it worth doing,...
How often should DPF regeneration occur? I bought a new Vauxhall Corsa in November 2012, 2 days after having the car and only driving about 10miles the DPF light came on. Most of my journeys are short,...
I have a Nissan Pathfinder 2.5 TDI, first registered in March 2006. Does it have a dual mass flywheel and DPF?
I'm looking to purchase new vehicle and was curious about the new Honda Civic 1.6 diesel - in the Honda dealership I was told that even though I only do a majority of short journeys and a maximum of 10,000...
My Ford Kuga is 3 weeks old and has 874 miles on. it now has an Engine Malfunction light and the car will not exceed 40 miles an hour. It has been back with the dealer for eight days and they do not know...
I have just bought a 2009 Ford Focus 1.6 TDCI Style 90. There is no mention of a DPF on any of the documents I have. Please could you advise, as there is so much conflicting information out there?
I have a Peugeot 307 SW HDI, bought new, 2002 or 2003 (not ex fleet!). 83,000 miles. I know the DPF needs dealing with but can a local service centre clean the filter as I certainly don't want a Peugeot...