Ask Honest John

Most recently answered diesel particulate filter questions
I had a DPF delete done in 2013 on my Ford Focus diesel. All was well until late 2014 when the powertrain light came on. I had the ECU checked, but no codes showed up. Since then I've had my local remapping...
I'm thinking of buying a Mazda 6 (2011 model). I love the car but have heard of a few DPF issues with this car. Did this model get improvements to the DPF or is there anything I should look for?
Is it true that some VAG diesels have been built using the "Manifold in Head" tech that other makes (Renault) have used to good effect in reducing DPF problems?
My Volvo V50 (2006) keeps slowing down on long stretches of the motorway, after an hour or so, and displays a sign saying "Engine System Service Required" on the dashboard. No garage, mechanic or anyone...
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...
 

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