Ask Honest John

Most recently answered v-power questions
Having read your columns for many years I notice how you advocate the regular use of higher grade petrol. I have a Skoda Octavia Scout 1.8 TSI and inside the fuel door there is a label that says use 95...
My daughter has bought a three year old Isuzu pickup truck with only 12,000 miles on the clock. The DPF light keeps coming on, the main dealer says that this is normal because it shows that the regeneration...
Soon after the emissions update our Skoda Yeti 2.0 TDL had to have a new ERG recirculating valve fitted at huge expense. Luckily, we we covered but this cover has now expired. The warning light has come...
My Skoda Yeti 2.0 TDI had the emissions update six months ago. I have since discovered a drop of 6.5mpg. Skoda say they cannot do anything, can anyone help please?
I have a 2011 Citroen DS4, purchased two years ago. Since January, the engine light keeps coming on and the car will go into limp mode. I had the emissions filter 'fixed' in January by the dealer from...
I stumbled across a couple of issues which seem to do the rounds on various forums, so I thought I'd ask here for a definite answer. One is that the Start-Stop mechanism, as implemented in the Audi A6...
I am looking to replace my 2009 Citroen C5 VTR+ Tourer 140 HDI with one that is 2 or 3 years old. I travel 8000 miles a year, 30% in town and the balance on motorways. I recently started using Millers...
My 2012 Hyundai i20 1.2, 41,000 miles on the clock is quoted an average of 57.6 mpg. Your website suggests that the real average mpg for this make and model is 46.9 mpg, but I’m averaging only 39 mpg!...
I've seen you recommend V-Power fuel multiple times and seen the reasons why - but I've always been told that if a car is regularly run on a lower grade of fuel (for example always supermarket fuel) then...
I usually fill up with branded diesel rather than supermarket diesel but would I get any benefit from switiching to Shell V-Power or similar? My car has done 65,000 miles. Would there be any risks involved,...