Ask Honest John

Most recently answered dpf questions
I own a 2007 Volvo XC90 with 118k on the clock. Lovely motor and mostly trouble free but it's recently started missing the odd beat and intermittently going into limp-mode. The other day, when in limp-mode,...
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?
I've thinking of changing my car, one possible buy is a Vauxhall Corsa. On looking through the technical specifications on the dealer's website for a 22 plate car it states the cars have particulate filters....
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.
Does my 2017 Kia Ceed diesel have a timing chain? Does it use additives to keep the soot particulates down? Does it need regular longer runs to keep any soot catalyst from blocking up?
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...
Is it true that new cars such as the Land Rover Discovery Sport use automatic engine management adjustments to keep the particulate filter clear even if no long journeys are done?
I have a 63 plate BMW 520D (F10)  Auto Efficient Dynamic version (Euro 6) As I drive a lot on motorway, the car has a high mileage, close to 180,000 miles. I had a "driven chain, check soon" message pop...
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?
I want to buy a small van for our dog walking business. The Peugeot Partner/Berlingo/Cargo Life are absolutely ideal for our needs. It is lots of stop-start short journeys so we looked at the 1.2-litre...