Ask Honest John

Most recently answered diesel particulate filter questions
I've read with interest your advice regarding low mileage and the problems with DPFs and also your view of the potential expense of failing dual density flywheels etc. for diesels - would these be issues...
Does the 1.6 e-HDi 112 stop and start engine with electronically controlled manual gearbox (ECG) have a diesel particulate filter? As I do 90% short trips I need to be certain it does not have a filter.
Had the mid section and rear box of the exhaust replaced at the beginning of March 2011. One fault is that the exhaust whines on acceleration - I assume this is because it is a new part and needs to be...
My 2007/57 model Peugeot 207HDi has started to leak/dribble small amounts of an oily fluid from a small plastic box situated on the underside just in front of the o/s/r wheel. What is the fluid and...
Can you tell me what a particulate filter does and why and how often they need replacing?
My 2.0-litre TDI 170 6sp A4 has been perfect so far whilst commuting 20 miles each way. Now at three and a half years old and 41,000 miles my new commute will be only 3 miles each way. I would like to...
I am not a high mileage driver. How do I prevent problems with the diesel particulate filter on this vehicle?
I currently drive a Renaultsport Clio 197, but I need a family estate car. I want to spend around £5000. I travel 18,000 miles per year so a diesel would probably be best for economy. Some comfort would...
An answer you posted recently pointed out multiple drawbacks to diesel ownership from the fourth year onwards, on a car under a 3 year lease. If I buy a new diesel car, will the maufacturers warranty...
I'm aware that modern diesel engines have particulate filters that can be unsuited to repeated short journeys (require a long run to clean them up, e.g. Mazda 5 diesel). When did manufacturers start using...