Ask Honest John

Most recently answered dpf questions
My van runs okay but is lacking power when accelerating. When the engine revs increase there is a warning light that comes on and the power fades.
I have a 2015 CLS 350 CDI. My concern is the DPF having read your column for a while. Even at speeds beyond legal limits, with the nine speed gearbox, it barely revs beyond 1750 rpm. As most of my mileage...
I had a DPF filter regeneration last week at an authorised dealer garage and I have noticed increase of fuel consumption from around 11 l/100 miles to 17 l/100 miles. Is that normal? If not what they could...
Our Outlander occasionally loses power at 60-80mph, no warning lights on dash and problems clears when engine is switched off and back on again. Any ideas please? Many thanks
Is there an easy way to be sure that the car I am looking at has the pre dpf engine set up? Given the fact that this engine has a dpf from mid 2010 is it better to buy a 2009 N-tek rather than a 2010 Acenta....
I recently had a problem with the DPF on my 2007 1.9 CDTI Vauxhall Zafira, which resulted in dealership recommending a full replacement DPF part. I sourced a new aftermarket replacement part which Vauxhall...
Despite driving in a 'DPF friendly' way my 2010 RAV4 SR150 auto has a blocked DPF at 67000 miles which won't regenerate. Toyota won't cover this want £1800 approx to replace. Is it worth trying Terraclean...
I'm thinking about getting an S Max as a family car but Petrol models appear to be thin on the ground. I'm apprehensive about getting a diesel as most of our journeys are short ones around town. However,...
I am thinking of buying a Nissan Qashqai diesel for towing my 1300kg caravan, but have concerns about the DPF. Would the 1.2 petrol engine be powerful enough or should I go with the 1.6 diesel?
I live in Jersey, and our Discovery 2 TD5 Auto is about to die. I am looking to replace it with similar, but a bit smaller, with a £20k budget. The car will do around 7000 miles a year, which includes...