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• 
  Why are there not more hydrogen cars? 25 Jun 2019 (Ask HJ)
  Why do manufacturers not making onboard hydrogen assist cars and vans to at least reduce emissions?
• Ford Monde - Ford Mondeo 2008 Petrol Cranks but won’t start 25 Apr 2019 (Forum)
  Hi All, Hope you can help. Ford Mondeo 2008 petrol cranks but won’t start. I did replace the fuel pump in March and it failed in two weeks so upon complaining Halfords replaced it and found it to be faulty. I went away for Easter break and since my return I did 200 miles and the same problem has come up and the Green flag technician thinks it’s fuel pump again.
• Vauxhall Mokka replacement 27 Nov 2018 (Forum)
  My daughter currently runs a Vauxhall Mokka 1.6 petrol which while she likes the driving position, however its rubish on fuel also her family is getting larger....she would like to change it for something bigger to accomadate three under 6year old children and automatic and better fuel compsumsion for her work commute...diesel would give the best mpg but I am worried of potential problems if she goes down the diesel route...she does do over twelve thousand miles a year....does an economical seven seater petrol engined alternative exist...your advice would be much appreciated as I am just getting more confused the more I look at possibles.
• Ford Focus 1.6TD reg 2009 - Best in-tank diesel system cleaner 25 Oct 2018 (Forum)
  I thought 60mpg was flippin` good. No external leaks.MOT imminent,so can anyone recommend the best fuel system cleaner that`ll worked on the injectors safely,so it stands a chance on emissions pass? It`s not smoking or using oil. Cheers.
• Audi A5 - Fuel economy 2 Oct 2018 (Forum)
  Ok so modern cars are obviously great and all, but I am really struggling to understand how my Audi A5 2.0 TFSi S Tronic is so economical? As it’s passed...
• Ford Ka - Performance/economy and coolant level. 15 Feb 2017 (Forum)
  For years my son has claimed the performance and fuel economy of his 05 Ka significantly worsens when the level in the coolant reservoir drops below the minimum (even though it's not empty). Although not pretending to be smart enough to understand this, I can't see any reason why this should be... yes, I can see how performance and fuel economy can vary for a variety of reasons (including faulty sensors/electronics), but not related to the level in the coolant reservoir.
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  What service does my Nissan X-Trail need? 7 Oct 2016 (Ask HJ)
  My father has acquired a 2004 Nissan X-Trail. The service history only shows basic oil/filter changes for the past three years and there is no paperwork...
• Drivers on miniroundabouts - Undertaking and overtaking on junctions 14 Jan 2016 (Forum)
  Waiting in a line of traffic for car directly in front of me to turn right. 1st car behind me undertakes to get in front of him. 2nd car behind me then undertakes to get 1 car ahead on a keep clear just before traffic lights.  ???? 2. Went to get fuel at a large supermarket and on the main road entrance there is a painted mini-roundabout, as I was turning, indicating a yoof  overtook me and then when he realised he was going to hit me tooted (a lot) and then turned into the petrol station and proceeded to nonchalantly fuel up.
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  Damage to car on petrol forecourt caused by bin blowing over 8 Jan 2016 (Ask HJ)
  My car was damaged (door dented) by Tesco bin while I was filling up car with fuel. Tesco say not liable??
• Vauxhall Astra H (2004 - 2009) - Fuel gauge reading incorrect 7 Sep 2015 (Forum)
  Hi everyone This is my second Astra H and it is displaying the exact same fault as my previous model.The gauge will read 1/4 of a tank but will be run...
• Citroen C5 2003 - Citroen Poor Starting 5 Dec 2014 (Forum)
    The problem seems worse in extreme temperatures i.e. very hot or very cold.  Dont'know alot about diesel engines but seems like poor compression?  Fuel starvation? Fuel pump seals?  Once the engine is started it drives perfectly......   All suggestions welcome.  Thanks. 
• Toyota Avensis - oem vs aftermarket oil air cabin fuel filter 22 Sep 2014 (Forum)
  I was wondering what your opinions are on makes of filters. I am going to service my car my self 2004 D4D Avensis. so far genuine filters made by...
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  Volkswagen Golf refuses to start 23 May 2014 (Ask HJ)
  I have a 2005 Volkswagen Golf Plus, 1.9 TDI. It has been struggling a bit when I start it and has been doing it for a while. However, now it won't start...
• Small turbos? 2 Apr 2014 (Forum)
  On paper, it sounds amazing, but I wonder what they are like in the real world. Is their performance that good and is their fuel consumption comparable to a normal engine? The only turbo I have driven is a Fiat TwinAir. I didn't really enjoy driving it and owners were reporting high fuel consumption. If I remember correctly you had to either completely abuse it for good performance (and high consumption) or you had to labour it and have no power, there seem to be nothing in the middle which is what I want for every day driving.
• Vauxhall Mokka 1.4 turbo 4×4 - can I use Shell Vpower in my new Mokka 3 Feb 2014 (Forum)
  I am about to take delivery of a Mokka 1.4 turbo and have contacted Vauxhall Uk about using Vpower in this vehicle as the manual reccomends 95 octane or possibly 98 octane whilst Vpower is 99 octane. They have informed me that the use of this fuel could invalidate any warranty in the event of any future engine problems. Bearing in mind Honestjohn recommending this fuel on a number of occasions c an anyone advise accordingly.
• FIAT Doblo - Diesel van fuelled with petrol instead of petrol 15 Jan 2014 (Forum)
    Has since driven van and has received conflicting advice on what to do: one garage says to have tank and fuel system drained; another independent machanic says it is OK to continue driving but not to over-rev and to add upper cylinder lubricant periodically.  Is it not the diesel fuel pump which is vulnerable to petrol because it does not contain oil lubricant?
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  Mercedes-Benz C-Class - what are the best tyres? 1 Dec 2013 (Ask HJ)
  I have Michelin Energy Saver 195/60 R16 89V on my Mercedes-Benz C-Class and now need to replace them. Should I go like for like or change all four with...
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  Ford Mondeo - which wheel size is best? 18 Oct 2013 (Ask HJ)
  I'm in the process of buying a new Ford Mondeo Zetec Business Edition. However, the 16-inch alloys are a no-cost option against the standard fit 17-inch...
• Any - Refilling The Fuel Tank - Full or Half Full? 7 Aug 2013 (Forum)
  Hi all, I always fill my car up when it needs refuelling. My mate only ever fills his half way arguing that the extra weight of a full tank increases...
• renault scenic 1.9dci privilage 55 reg - injection fault message 18 Jun 2013 (Forum)
  i recently broken down and had to get rac out as car engine would not start,rac guy squeezed fuel primer and then it started.it is fine driving but next day message came on dashboard of injection fault as car would not start,i squeezed primer again and it started and drove fine. i was told it could be dirty fuel so i have added deisel injection cleaner and might take a couple days to clean.