Ask Honest John

Most recently answered nox questions
I’m about to by a Suzuki JIMNY SZ4 auto 2011 model It’s euro 4 compliant I live in Watford going into both ULEZ ‘s How long will Euro 4 be compliant for?
Is supermarket fuel quality being compromised due to the large mark up they are being allowed to charge? My 25k mile Audi Q7 engine light came on recently and turned out it was a Nox sensor failure, Strange...
I was under the impression that the French authorities had banned classic cars - even if they were over forty years old - from entering major French cities. With this in mind, I wrote to the French embassy...
The DPF warning light has come on in my Audi Q3. It had the emissions update in March 2017. Audi have said that they will charge me £60 for diagnostics. If the problem is caused by the update then they...
I had a test drive of the Mitsubishi L200 yesterday. It's much better than the old one. Am I right in thinking that some of the first series were Euro 5, whilst the new ones are Euro 6? In view of changing...
I had my SEAT Leon fixed because of the emissions scandal. Shortly afterwards, the aircon failed - the compressor is kaput. I had it fixed for £804. Could this be related to the fix? The car has done 50000...
My Audi Q5 has a smell like hot tarmac around the rear and exhaust area after a good run. It doesn't smell like oil and the oil level is steady after 500 miles. No smell under bonnet or car sides. What...
I have an Audi A1 Sportback, bought new in 2012. Current miles on clock just under 33,500. Last month it went in for the emissions software installation and since then the fuel consumption has increased...
I'm experiencing a lot less mpg, more noise, more DPF regeneration and less power since my car had the emissions update in August 2016. If you are in touch with Volkswagen engineers in Germany, can you...