Ask Honest John

Most recently answered diesel particulate filter 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...
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 went to my local independent garage with a fuel additive warning on the dashboard. They topped it up but the engine management light came back on. I have now discovered that they used AdBlue in an Eolys...
Which DPF system is on 2013 Mazda 3 1.6 diesel and do you recommend buying one if doing 7000 miles a year?
I purchased a used Nissan Qashqai 1.5 dci (2008) a couple of months ago with 38,000 on the clock. Everything was fine until a couple of weeks ago when it started to stutter quite noticeably. Initially,...