Ask Honest John

Most recently answered diesel particulate filter questions
I have a 2013 Volkswagen Touran 1.6 diesel with 13,000 miles on the clock. Recently the car has been giving me some problems. A while ago it was emitting a strong oil smell, which turned out to be a split...
I have always had petrol engine cars myself, but my dad has recently purchased a 2010 (60) plate Volvo C30 D2 (1.6 diesel engine, facelift model, R-Design) from a car supermarket. It has around 54,000...
Six months ago I bought a car from a well-known dealer for £10,000. It had done 30,000 miles when I bought it and I took out a warranty for three years. The clutch went after two months which they replaced....
Our Citroen C8 2.2 diesel (2008 model) has developed an intermittent loss of power, which triggers the engine management light to activate and a DPF filter fault to be displayed on the dash. Our local...
I own a 2016 Nissan Navara, which needs a new DPF after just four months. This is my 4th Navara and never had issues before. There is no mention of the driving standards or shorter journeys in user manual....
I own a 2012 Mazda 3 with a 1.6-litre diesel engine. Recently a warning light came has come on, stating that the oil level is too high. A local mechanic tells me this is something to do with the DPF regeneration....
Do any vans tell the driver when a DPF regeneration is starting or taking place?
You frequently advocate the use of Shell V-Power Nitro Diesel which I have used in my Citroen C5 from new. You also state that diesel engines are prone to suffering from clogged up DPFs at 80,000 miles,...
I just bought a SEAT Leon diesel with 52k on the clock. Within 2 weeks the DPF yellow light came on. The car had a couple of hundred motorway miles in that time as well as some city driving. The car...
I'm considering purchasing a used Renault Trafic, although my question is about DPFs in general. So to start regeneration you should be driving motorway speeds to achieve high exhaust temperatures, how...
 

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