Ask Honest John

Most recently answered diesel particulate filter questions
I have been told that if I do several short trips in a 4x4 with a dpf i can un block it by engaging low in theauto box and then driving flat out up a steep hill for about one mile. Could this be true and...
I'm thinking of replacing my six year old Honda Accord 2.0 EX (petrol) with the new 2012 model. The new 2.2 diesel engine seems to be getting good write-ups, but I am concerned about your previous comments...
The Ford web site http://www.ford.co.uk/Cars/Fiesta/Enginesandtechnology gives the 1.6 diesel engine as available with or without a DPF. I would like to purchase a Fiesta without a DPF, as I will be reducing...
My 2005 Volvo S40 diesel has suddenly lost most of its power; due to error "2452 Particle trap pressure sensor faulty signal", according to my local workshop that looks after it and tell me that it needs...
I have been having a hell of a problem since April with a Skoda Fabia Estate diesel with a DPF, blatantly mis-sold to us and obviously "not fit for purpose". We were told nothing about the inner city...
I have been offered a BMW 320SE diesel with an 06 plate, but as I do a lot of local mileage interspersed with some longer journeys, I do not think it will be the right car for me if it has a particulate...
The new Ford Focus Powershift presently comes only with a Diesel engine. Is the diesel problem RECTIFIED on this new model or do they still come with DPF? If they still have DPF would 20 miles on the...
I have in the past read various references you have made to "particulate filters" in diesel cars. I purchased a Volvo D3 S60 diesel manual in December. Within six months the warning light came on indicating...
Using premium fuel (Shell V-Power) seems to be the only way to avoid particle filter problems with AUDI A3 in the UK. What grade Diesel do I need to purchase on Mainland Europe to avoid the same problem?
I wonder if you can explain this. We have a FIAT Multipla 1.9 JTD Eleganza, 58 Reg, 15,000 miles on the clock. Last Thursday while my wife was driving, the EOBD Injection Warning Light came on amber and...