Ask Honest John

Most recently answered dpf issues 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"...
We have four children and are struggling with our Citroen C4 Grand Picasso. We need a secondhand replacement with space and a decent boot, so very few cars are suitable. We do 6000 miles per year with...
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?
I bought a new Mitsubishi Challenger L200 from a dealer in May 2015. The engine seized and the car was written off in October 2017, after only 17,000 miles. It had not been serviced, so the dealer and...
I'm the Business Manager of a Special School in Kent. Our older students regularly go out on short trips in small groups to improve their life skills and gain Work Experience. We're looking to purchase...
I do 15,000 miles per year and almost never do less than 30-mile round trips. I would like a diesel but think I'm on the cusp mileage wise. What do you recommend?
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?
 

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