Ask Honest John

Most recently answered technical issues questions
Should I add injector cleaning fluid to my 2007 BMW 525d diesel engine?
I currently drive a Volkswagen Golf Plus and am looking to change it, but don't really want to spend the money commanded for a Golf SV. My challenge is that I am a very big guy with very large thighs and...
My sister’s 2005 Ford Focus 1.6 is getting very poor fuel economy, about 24mpg on short trips and about 29mpg on long trips. I have fitted new plugs, air filter, oil and oil filter. I’ve also checked the...
My Fiancee and I are looking to replace our 2010 Mercedes-Benz SLK and 2011 BMW 1 Series with a new or nearly new Jaguar XF 3.0 diesel. We are quite active - cycling, caving, flying, golf - and will need...
The heater in my Skoda Fabia won't work until about 20 miles into a trip. My local dealer has quoted £500 to replace it. Any suggestions?
I would like to tune my 2004 BMW X3 2.0 diesel, which currently has 150PS. The racing chip will increase torque from 330 to 412Nm and raise output to 192PS. Do you think this will work with the X3?
I bought a new Qashqai 1.6 diesel here in Cyprus in May 2014. I have taken it back to the dealer three times now due to 'System failure' message appearing in regards to the Start/stop' system. The dealer...
I have owned my 2002 Mercedes-Benz C-Class Sport Coupe 220 diesel since new. It has now done 95,000 miles and has been regularly serviced and immaculately maintained. However, for the past few months,...
When do new Euro 6 emissions regulations come into force; I have read both January 2015 and September 2015?
I have a Ford Focus 1.6 petrol (2001) and have recently been experiencing starting problems with it. I assumed it was starter motor, but now I'm not so sure as it started first time the following day,...