Ask Honest John

Most recently answered diesel car maintenance questions
I've been reading some of the problems Mazda 6 owners have with DPFs. My Mazda 6 now has 93,000 miles on the clock, it had 90,000 when I bought it. I mostly do short runs (less than 15 miles). What should...
Can you please advise how to regenerate the DPF on a Mercedes-Benz E-Class?
I have a 2008 Renault Koleos 2.0d. In the past two weeks I've done four journeys in excess of 50 miles at high speed (dual carriageway). A couple of days ago, a warning appeared saying "check exhaust emission"...
Although I really like my diesel Mazda 6, I had no knowledge regarding the DPF i.e. short runs not doing it any good. Are there any other cars with as good a spec as the Mazda 6, which are less complicated?...
My Kia Sportage oil level reads at well over the max mark when the engine has been running. I've been to Kia and they can't find a problem. What do you think it is?
My Mazda 6 has a particulate filter warning light flashing, despite two hours on the motorway. The car has never done this in four years of ownership. It's done 99,000 miles. Does the DPF need cleaned...
I was sold a brand new Nissan X-Trail diesel almost two years ago. I told the dealer that we only travel around 8000 miles a year and now I'm being told the car needs £300 of work due to not being driven...
I have a risk of particle filter blocking warning showing up. Why is the regeneration not clearing it even after a long run at high speed?
I recently bought my son a BMW 1 Series for his 18th birthday. Soon after the filter light came on. We took it to a garage to be looked at and the turbo was burnt out, so had to be replaced. We also had...
SEAT contacted me after one year of ownership about the annual service on my 2.0-litre diesel Alhambra. However, now they say that my car did not need a service until it was two years old. This incompetence...
 

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