Ask Honest John

Most recently answered dpf questions
I have a three-year-old CR-V that has done 37,000 since new. It has misfired, which has been reported to dealer and Honda UK. The misfire is getting worse. I had a DPF warning light come on three weeks...
On the subject of DPF removal, which you covered recently, how would I know if the DPF is still intact on my car, a Citroen C6 2.7HDi? I read that it can be removed and everything welded back so as to...
I have recently bought a four year old Volkswagen Touran 1.6 TDi with 17,000 miles on the clock and a full service history. The issue of DPF comes up on your site often and this is raising concerns. 1)...
Where is the DPF warning light located on the dashboard of the Jaguar XF 2.7 diesel (2008 model)?
With improvements in DPF technology as in Mazda skyactiv and 1.6 Renault/Nissan diesel, do you think this has only solved one problem of many in modern diesels if the car was to be kept long term? Do you...
I have a 2012 Hyundai ix35 1.7 diesel, which is under a finance agreement. The vehicle frequently goes into limp mode, exclusively under acceleration such as overtaking or joining the motorway. The dash...
Are there any diesel engines where the regen fuel is not injected directly into the engine on the exhaust stroke? To my mind a DPF should ideally be as close as possible to the exhaust manifold and have...
I am thinking of purchasing a five year old Mazda 6 2.2 diesel. I've identified a few for £7000 that have around 70,000 miles on the clock. Would you count these cars as good buys? I'm a little bit confused...
I have a commute of eight miles a day, five days a week. Over the course of a year, I cover 8000 miles and I rarely do journeys of more than 10 miles. Will a new Nissan Juke 1.5 diesel be suitable for...
My Vauxhall Insignia emission filter light is constantly flashing. At first the light came on with 'code 55'. I researched this and did as advised by driving over 2000 revs to clear it. The code 55 disappeared...