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  My car battery failed after just four weeks - is the dealer liable? 7 Aug 2018 (Ask HJ)
  I bought a five year old Vauxhall Cascada from a main dealer which included a two year NetworkQ warranty. In the first week of using it I reported a number...
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  How can I tell when my hybrid Auris is running on electric or petrol? 19 Apr 2017 (Ask HJ)
  I am in the process of buying a 2010 Toyota Auris Hybrid but I notice there is no indication of when you are running on electric and when you are running...
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  What could be causing the battery in my Mercedes-Benz V220 to discharge completely? 6 Jul 2013 (Ask HJ)
  I have a 2003 Mercedes-Benz V220 CDi. It has developed some kind of electrical fault that two Mercedes garages have failed to solve. Basically the battery...
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  Why does my Alfa Romeo 159's battery keep going flat? 13 Aug 2010 (Ask HJ)
  I have an almost new Alfa Romeo 159 TI. I have no complaints with the car other than a battery problem. There are occasions when I have to attend conferences...
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  Are PHEVs expensive to run and maintain? 18 Nov 2022 (Ask HJ)
  I haven't seen any discussion on maintenance costs for PHEV. Presumably, it must be quite expensive since you are maintaining an EV plus an ICE?
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  What's the fuel efficiency of a plug-in hybrid when the battery has run out? 19 Jul 2021 (Ask HJ)
  Is there a rule of thumb about how much less efficient a plug-in hybrid is when the battery runs out compared to a combustion engine equivalent? For example,...
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  Why is my car's battery losing charge? 20 Apr 2020 (Ask HJ)
  I have a 2015 Golf 2.0 TDI that has done 35,000 miles and been serviced by Volkswagen since new. I've owned the car for 13 months. I've noticed the battery...
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  Is the Renault Zoe battery lease scheme ending? 30 Oct 2019 (Ask HJ)
  I was at a launch event for the new Renault Zoe the other evening and the sales team were unsure that the battery lease scheme was going to be available...
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  How much charge will a PHEV battery lose over five years? 10 Jun 2019 (Ask HJ)
  I am thinking of buying a PHEV. I intend to keep the vehicle for five years and I do 15000 miles per year. I am a little concerned at battery deterioration...
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  What jump starter should we buy for our minibus? 30 May 2019 (Ask HJ)
  My village charity group operates a Citroen Relay minibus. As a starting backup we would like to purchase a Battery Power Pack for emergency use should...
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  My car's start-stop won't work because of a partly discharged battery - would a trickle charger solve the issue? 29 Mar 2018 (Ask HJ)
  My 18 month old Mercedes-Benz E-Class won't automatically stop-start anymore due to a partly discharged battery. It's left in my garage for weeks at a...
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  Kia stop/start system? 23 Nov 2015 (Ask HJ)
  I have a 2014 Kia Cee'd 3 1.6 CRDI Eco which I am pleased with on the whole but puzzled by the Stop and Go system which refuses to work when the conditions...
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  Breakdown services and battery sales 29 Dec 2011 (Ask HJ)
  Please publish this warning to your readers. Two week's ago, my wife's car failed to start. Being a member of one the largest car breakdown service...
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  Lies, damn lies and static tests 23 Jun 2011 (Ask HJ)
  Regarding battery leakdowns, I have a friend who is a modern auto electrician, by which I mean he has all the latest kit code readers, etc., but for a...
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  How long are the batteries in my 2006 Toyota Prius likely to last? 10 Oct 2010 (Ask HJ)
  I have a 2006 Toyota Prius with which I have been very pleased. It is approaching four years old, half the guaranteed battery life, and I wondered if you...
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  Are you aware of a new Mercedes-Benz / BMW electric car battery exchange project? 30 Jun 2010 (Ask HJ)
  I recently passed a new factory which was not working yet. I asked what it was for and was told it is a new joint venture between Mercedes-Benz and BMW...
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  Well soaked 17 Oct 2009 (Ask HJ)
  Yesterday I noticed water in the rear passenger foot well of my VW Passat saloon. Year is 1999. I am not sure how it got there and I no nothing about cars...
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  Will a PHEV recharge itself when driving? 11 Aug 2021 (Ask HJ)
  Do plug-in hybrids recharge the battery whilst moving like standard hybrids?
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  Why is the engine in the Nissan Qashqai ePower so big? 20 Oct 2022 (Ask HJ)
  Why is the ICE in the Nissan ePower so big, if it is only required to charge the battery? Couldn’t it be much smaller and lighter?
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  Why isn't my stop-start working? 19 May 2020 (Ask HJ)
  My stop-start engine stopped, as per normal, at a set of traffic lights - but then wouldn't automatically start again. Why's that?