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  Parking car on flat tyres 3 Feb 2011 (Ask HJ)
  I took my 4x4 to a garage to get nitrogen filled in the tyres. The mechanic deflated all the four tyres while the wheels were still on ground (he did not...
• Citroen the 1st Car Manufacturer to use Ad Blue? 19 Mar 2015 (Forum)
  BlueHDi powered New Berlingo models have an efficient, three-stage SCR process to treat emissions caused by combustion: – Stage 1: an oxidisation catalyst converts the unburned hydrocarbons (HC) and carbon monoxide (CO) in the exhaust into water and carbon dioxide (CO 2 ) – Stage 2: the SCR module then adds AdBlue to convert nitrogen oxide (NO x) into nitrogen (N) and water – Stage 3: a particulate filter then eliminates 99.9% of particles in the vehicle’s exhaust emissions BlueHDi powered New Berlingo vans have a 17-litre AdBlue tank, which will last for up to 14,000 miles, depending on the type of vehicle operation.
• Any - Boyles law and tyre pressures 11 Mar 2017 (Forum)
  Oh dear, HJ seems to have got a bit confused here http://www.honestjohn.co.uk/askhj/answer/75465/is-putting-nitrogen-in-tyres-a-good-idea- I thought the only possible advantage of pure N2 as opposed to using air was that the oxygen might degrade the rubber (to a small extent). It has nothing to do with the temperature dependece of the pressure which will be true for all gases.
• EGR valve adjustment. Ford Transit 2.5Di 4 Oct 2012 (Forum)
  The valve stays closed all the time and the exhaust stays smoke-free all the time, but of course the oxides of nitrogen are presumably higher than desired. The second method would be to adjust the linkage which controls the butterfly valve which modifies the vacuum which operates the EGR valve. My manual (Haynes) basically says ?
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  Is the EGR cooler problem on my Skoda Yeti linked to the emissions fix? 27 Jan 2017 (Ask HJ)
  I have a Skoda Yeti 2.0-litre diesel, bought in March 2012 . The Skoda garage performed the software update to correct the Volkswagen diesel emissions...
• Does this mean I can still drive a v8? - E-Fuels (Synthetic Fuel) 9 Mar 2021 (Forum)
  “ Synthetic fuels are made by extracting hydrogen via renewable energy, and capturing it liquid form with carbon dioxide. Compared to pump fuel, eFuels emit fewer particulates and nitrogen oxide as well.” And for BBD, the press release from Mazda: https://www.mazda-press.com/eu/news/2021/mazda-first-oem-to-join-the-efuel-alliance-/
• New tyre pressures! 5 May 2009 (Forum)
  I had 4 new tyres fitted 2 weeks ago at an independent tyre firm in Derby. These tyres were filled with nitrogen and the fitter was told the correct pressures. I have just checked the pressures with 2 tyre gauges. One was 6psi under inflated, one was 4psi under, one was 3psi under and believe it or not one was the correct pressure.
• Nissan Primera III (1999 - 2002) - 01 2.0 DIY A/C Condenser/Drier replacement 10 Aug 2009 (Forum)
  Hi, I've just had a leak in my A/C diagnosed via a nitrogen test as being on a small pipe between the condenser and drier (seen with my own eyes). I want to replace the condenser and drier myself and then take the system for evacuation/oil and gas recharge.
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  Why is my car ULEZ-compliant but has a high rate of road tax - why? 15 Aug 2023 (Ask HJ)
  My Shogun is ULEZ compliant (lower emissions) so why is the road tax £675 pa? Surely it should qualify for lower tax like my friend's Shogun who pays...
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  How do I appeal the ULEZ charge and avoid paying the daily fee? 7 Aug 2021 (Ask HJ)
  My wife and I drive a diesel Volvo XC70 (first registered in 2006) and a Volvo XC60 (2013 model). Both have very low emissions readings on their MOTs and...
• Welding experts?? 10 May 2003 (Forum)
  The local aircon specialists reluctantly agreed to get someone to have a go at resealing with a weld since the cost of replacement (if they can find a condenser)is probably as much as the car is worth. After £50 worth of trying they called a halt because nitrogen testing showed pinprick leakage through all three welds tried. The welder (from a different company) wasn't present to explain further. My question is whether there is a welding process that might provide a gas tight seal since the problem seems to lie with the porosity of the materials used.
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  How do I find out what EU rating my car is? 10 Jun 2019 (Ask HJ)
  I would like to know what EU rating my BMW 520d is? It's registered 2012, but the VC5 left column K type approval number is e1*2007/46*0363*05. I read...
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  Can I get the tax band of my car changed? 7 Jun 2023 (Ask HJ)
  I have owned a 2014 Volkswagen Caravelle 2.0 TDI for the last 3 years and have pad £340, £360, and £395 car tax for those three years. It states on my...
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  Why is my car not compliant with the London ULEZ? 1 Feb 2022 (Ask HJ)
  My car is a BMW 318d on a 14 plate. I did a check on a couple of websites and it came back as not acceptable for the London Ultra-Low Emission Zone (ULEZ)....
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  In view of changing legislation, would buying a Euro 5 pick-up be a mistake? 4 Dec 2017 (Ask HJ)
  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...
• CAR EMISSIONS 25 Apr 2001 (Forum)
  Buses, lorries, and taxis stand out as the major contributors to urban motor vehicle pollution. An older articulated lorry produces as much particulates as 350 new petrol cars and the nitrogen oxide of 284 new petrol cars. The current generation of petrol cars produces around one-sixteenth of the toxic urban pollution of their non-catalytic converter forerunners.? What do you think?
• USA wakes up to diesel cars ? 9 May 2007 (Forum)
  But cleaner diesel and new engines from DaimlerChrysler and Honda that convert harmful emissions into harmless nitrogen could have diesels making inroads. Strategy Analytics predicts that once the new diesel fuel has been approved in the five ultra-low emissions states, which account for 37 percent of hybrid sales, "diesel will challenge hybrid vehicles for the more cost-conscious 'green' consumers
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  We bought a Euro5 van in 2016 - should it have been Euro6? 15 May 2019 (Ask HJ)
  I bought a new Mercedes-Benz Sprinter from a Mercedes dealer in April 2016. It has a Euro5 engine so is liable to the ULEZ charge. I believe I have been...
• 
  Rider haggard 22 Apr 2011 (Ask HJ)
  Now 86, I regard my Mercedes A150 Classic SE 5Dr BlueEfficiency as my last car. It is a pleasure to drive, and on motorways it is fine, but on poor country...
• ouch - 4 new tyres required 3 Jul 2007 (Forum)
  I carry heavy loads, in my Espace, and so have always used Michellin Primacy hp, 225/55r/16/95w (x,y,z) this evening I have looked at many companies from "mytyres" good price £116.50 to "Kwik fit" £178, more convenient and often have matched other quotes and several other companies in between. One company mentions that filling the tyres with nitrogen at £1.76 /wheel provides better road handling, upto 25%increase in life expectancy and can reduce fuel consumption - so how come I've never heard of it before and nor has anyone I've spoken to, admittadely non are petrol heads.