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• Is Diesel a false economy? 3 Jun 2011 (Forum)
  Ive been wondering this for a while, with fuel prices rising more and more people switching to Diesel cars, indeed for the first time new car sales has had Diesels in the majority in the UK, but is it a false economy? In almost every case brand new the diesel variant of a car will cost more than its petrol equivalent, even with better fuel economy and lower VED it can take 1-3 years (even on medium-high mileage) to break even and then begin to see profit.
• Sulphurious 12 Apr 2002 (Forum)
  Low Sulphur diesel is causing a higher incidence of fuel pump failure due to the decrease in lubricant. Discuss.
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  What's the cause of my car's falling fuel economy? 19 Apr 2015 (Ask HJ)
  My wife's Toyota Yaris diesel (2011 model) has been averaging around 60mpg since we bought it at 40,000 miles/two years ago. The car has now done nearly...
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  Clogged up C-MAX 30 Oct 2013 (Ask HJ)
  My C-MAX, 11 Reg, 21,000 miles has gone into Limp Mode on a number of occasions. It is in warranty and serviced by Ford Agents since new. The local agent...
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  Air in my diesel fuel system 14 Nov 2012 (Ask HJ)
  I have the a Citroen Berlingo with the 1998cc HDI engine. It has nearly 160,000 miles on the clock, and has been fully serviced. Runs brilliantly, except...
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  Buying a used estate for the family 30 Jan 2012 (Ask HJ)
  My wife is looking to buy a family estate for the arrival of our second child, and also to use for her garden design business. We have a budget of...
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  Brim reaper 4 Sep 2010 (Ask HJ)
  I have often thought that the mileage taken for the fuel gauge to noticeably drop below the 'Full mark', after filling the tank, can be quite variable...
• Renault - 94 2.5 Master T35D Leaking Diesel 12 Jul 2009 (Forum)
  Hi there, I don't know if anyone can help me but I've a 1994 Renault Master T35D camper van with a non-turbo 2.5 diesel engine. Recently it's been getting air in the fuel system to the point that I can't start it from cold without first priming the fuel filter by pressing the plunger pump around 30 times. After that it starts ok.
• Mazda 626 (2000 - 2002) - 00 2.0D Diesel leak 10 Jul 2009 (Forum)
  I have an old Mazda 626. After a visit to a specialist aircon garage to get the air con fixed it developed a diesel leak. Not sure if this leak is related to the mechanic trying to fix the aircon as the leak is where one of the fuel pipes enters the engine block. It doesn't seem likely this area could have been disturbed but it is a bit of a coincidence that the leak started when it did.
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  I put AdBlue in my diesel tank - why do manufacturers put the caps so close together? 15 Feb 2018 (Ask HJ)
  I've accidentally put AdBlue in my diesel tank, which seems to be a really bad thing (possibly worse than petrol in a diesel car). Why do Renault put the...
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  Diesel repeatedly leaking into sump 4 Jan 2016 (Ask HJ)
  Since buying the car in Jan 2015 it has suffered from diesel leaking into the sump from the fuel pump on 3 occasions. On the first 2 occasions the pump...
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  Renault Clio '56 plate fuel pump diesel problems 27 Jul 2012 (Ask HJ)
  I am contributing owner feedback in addition to the below found on the link http://www.honestjohn.co.uk/carbycar/renault/clio-iii-2005/?section=bad I...
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  Maximum dies-conned 24 Oct 2009 (Ask HJ)
  Could you quickly explain the logic behind there being no point in buying diesel unless you do over 15k miles a year? I do about 7k miles a year and estimate...
• P reg diesel 1800 glx turbo estate 19 Jun 2006 (Forum)
  Hello Everybody, Just wondered if anybody can advise me on the diesel fuel sender ??? I have just bought the mondeo diesel estate and filled up the tank and it is only reading between 3/4 and 7/8 full, How difficult is it to change if i have to and are they very expensive.
• Best Diesel? 10 Feb 2004 (Forum)
  In the column Honest John regularly recommends premium petrol such as Shell Optimax. Is there any benefit to my car, e.g. longevity, fuel economy of purchasing Shell Diesel, Shell Diesel Plus or am I best to stick to Tesco's cheapest? I am interested in technical details or other websites if anyone can point me in the right direction please.
• Vauxhall Astra G Diesel - code 1335 25 Nov 2017 (Forum)
  I have code p1335 on my car as wont start, have put new crank sensor on and still the same. Fuel pump replaced so Iknow thats not the problem. Any suggestions...
• Writing to Honda 27 Jul 2005 (Forum)
  I'm very dissatisfied with the fuel consumption of my Accord diesel and I'm inclined to write to Honda saying this. Would other Accord diesel owners do the same thing, so that if Honda were to receive a shoal of such missives they may be inclined to take action?
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  Did diesel freeze cause my Volvo V50 to lose power? 5 Dec 2012 (Ask HJ)
  Setting off after parking my Volvo V50 1.6D DRIVe overnight in temperatures down to -16 degrees C, the car kangaroo jumped for a couple of minutes with...
• Honda CR-V 2.2 I-CDTI diesel - Main relay location 25 Jun 2020 (Forum)
  Does anyone know where the main/PGM-FI relay location is on a 2009 Honda CR-V 2.2 CDTI (diesel).  there should be one (main) relay in the under hood fuse box and another (fuel pump) in the cabin fuse box.  But both fuse boxes do not have either relays.  this is the cabin fuse box.
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  Van starts, but wont idle - what's the fault? 15 Jan 2016 (Ask HJ)
  My Ford Fiesta van starts, but then refuses to idle and dies. Sometimes it will restart - in a plume of black smoke - sometimes it won't start at all....