Ask Honest John

Most recently answered technical issues questions
I've just replaced my W211 model E-class 220CDi with a September 2009 reg W212 model CDi, choosing the new model largely on the basis of the promised fuel efficiency. On mixed motoring - and I'm quite...
My 05 plate Golf Plus 1.6FSI has recently Catalytic Converter failure with only 24,162 miles on the clock. I intend writing to VW to ask for their comments and to see if they would like to inspect the...
As a pensioner I have understood diesels to be less efficient than petrol on short journeys as they take awhile to warm up. Can you explain what EGR and DPF are?
Fault C1228 showed up 2 months after expiry of the 3-year warranty of my Mazda3. The Mazda dealer in Taunton, where I bought the car at 12 months old, and Mazda UK Customer Services don't want to know...
I recently purchased a nearly new Mazda 6 station wagon. I find it does not have a spare wheel, just a can of aerosol in case of a puncture. Enquiring at my Mazda dealership, I was told a full sized spare...
Time has come to replace two of the Dunlop 225/50/R17/94W Dunlop Sport 01 run flat tyres on my car. I am considering changing to non run flat tyres and I believe you have suggested a suitable alternative...
In April 2009 I bought a one-year-old Nissan X-trail. At the end of July, having covered 2000 miles in France in just over a week the particulate light again came on together with the Malfunction light....
You have recently advocated the use of winter tyres and I am exploring this possibility for next winter. I would prefer to buy a new set of wheels and tyres, and whilst there is a wide choice of tyres...
You have answered readers’ complaints about rapid wear of brake discs with an explanation that corrosion due to light usage is the cause. Whilst this has a small effect on disc wear this has always been...
How many readers have AUDI, SEAT, SKODA, or VW products with Teves ABS faults and replacement parts costing £1,170 - £1,300? We currently have had this problem on both a 2.0 TDI SEAT Altea and a 2.0 TDI...