Ask Honest John

Most recently answered dpf questions
I currently own a Toyota Auris T180 with the 2.2 D-Cat diesel. It is a great engine but the cabin is disappointing and, having recently become a grandfather, I need more boot/closed hatch space. I am tempted...
You probably know that Volvo have issued a safety recall related to rising sump oil levels in their D5 Diesel engines with a DPF, which is caused by excess fuel entering the engine sump via cylinders during...
I’m interested in purchasing a new Skoda Octavia Estate with the 1.6 CR diesel engine, but I'm concerned whether my daily drive to work is suited to a DPF. One way, my journey is rural and about seven...
I have been investigating details of new cars, though I do not expect to buy one yet. On the whole, diesel cars are more economical and may produce less carbon dioxide than petrol powered cars. However...
I recently brought a new Audi 1.9TDI from my local Audi dealership in a London suburb. After approximately one months ownership I started to encounter issues with the diesel particulate filter. The warning...
As a pensioner I have understood diesels to be less efficient than petrol on short journeys as they take awhile to warm up. Can you explain what EGR and DPF are?
In April 2009 I bought a one-year-old Nissan X-trail. At the end of July, having covered 2000 miles in France in just over a week the particulate light again came on together with the Malfunction light....
My 2007 Hyundai Tucson CRTD CDX 07 diesel has been showing a flashing amber warning light. The handbook says "emissions system check particulate filter.” The advice given by the dealer is to run at sustained...
I would be grateful for your advice on the following matter. I have noted that on occasion you have highlighted the problems and associated remedial costs caused by failure of diesel particulate filters....
I am looking to replace my Fiat Stilo Estate with a Skoda Octavia Estate and considering one with the 1.6 diesel engine with DPF (Particulate Filter) especially given low road tax. I note your recent articles...