Ask Honest John

Most recently answered diesel particulate filter questions
Is the DPF on a Fiat 2.3 Multijet engine expensive to replace?
I have a 2022 Dacia Duster Blue dCi. I was told to take it for a motorway run at least one a month. I only do 8500 miles per annum but half of that is motorway. Is 1700rpm @ 60mph fast enough to keep the...
Is there a diesel car yet that can cope with town driving/short journeys without clogging the diesel particulate filter (DPF) and exhaust gas recirculation (EGR) components?
How do diesel hybrids cope with switching on and off, between diesel and battery, if they have a DPF fitted? Even a medium length drive might involve lots of battery power and the diesel never getting...
I have a 2018 Range Rover Evoque 2.0-litre diesel. I do mixed driving and wonder if putting some DPF cleaner would help any possible build up of carbon. I have had no problems to date.
I have just purchased a Honda CR-V 2.2 diesel Mk3 model AWD. Does this vehicle have a DPF as I do not do much motorway driving? It is a 58 plate.
I have a BMW X18D. The vehicle is consuming oil. There are no leaks so the oil is being burned into the engine. The DPF light has now come on. My mechanic informs me that the DPF is getting so hot that...
What is your advice on disconnecting a DPF from a diesel car and running it without one?
You recently suggested that low mileage has an impact on blocked diesel particulate filters. Low mileage has nothing to do with it. If I don’t regularly drive short journeys but give it a run on the motorway...
Is it possible to purchase anything that lets you know when your diesel particulate filter (DPF) is regenerating e.g. something simple like a bulb lighting up?