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  K&N air filter 16 Oct 2011 (Ask HJ)
  I'm thinking of fitting a K&N air filter to my Toyota Auris 1.6 petrol manual 2008. Would it improve performance, affect fuel economy, or affect my insurance?
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  Fuel consumption 5 Dec 2010 (Ask HJ)
  I have a Peugeot 206 2.0-litre HDi, which has suddenly started using fuel excessively. What could be the cause? It used to return approx 50mpg but this...
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  Volkswagen Golf type confusion 2 Oct 2015 (Ask HJ)
  The initial talk in the US media was that this issue concerned cars using the Adblue system. I have a 2012 Golf convertible 2.0 TDI BlueMotion manual...
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  Increasing oil levels with Yaris diesel 1 Feb 2015 (Ask HJ)
  My 2011 Toyota Yaris diesel is suffering from increasing oil levels. It seems that diesel is getting into the sump. The car is still under warranty and...
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  Can I take my warranty company to the small claims court? 11 Sep 2010 (Ask HJ)
  I have a claim on an extended warranty for a broken-down ECU, sensor and wiring harness which had to be replaced. The cause on the invoice was "Thermister...
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  How can I get my Peugeot 307 through its MoT? It's failed on emissions. 31 Aug 2010 (Ask HJ)
  My Peugeot 307 1.6 diesel has just failed the MoT on emissions. There are no warnings on the dash and my mechanic is unsure of where to start to fix the...
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  Engine doesn't start - should diagnostic check discover the fault? 13 Jan 2013 (Ask HJ)
  I run a Vauxhall Corsa diesel 1.3 Club, 58 plate, 43,000 miles on the clock, regularly serviced. It is a driving school car. Recently, in the middle...
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  Why do my car windows open all by themselves? 28 Jul 2018 (Ask HJ)
  I returned to my car to find all of the windows open. Is there a fault with the motors used to open/close the windows? The car is a SEAT Leon.
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  What caused all four windows in my locked 2013 Skoda Octavia to open overnight? 14 Feb 2017 (Ask HJ)
  I left the windows of my locked 2013 Skoda Octavia closed and in the morning all four windows were half open. What could cause this to happen?
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  How can I fix faulty locks on a Hyundai i10? 22 May 2015 (Ask HJ)
  My 2008 Hyundai i10 keeps unlocking and unlocking itself at night. The car's been to the garage and they have reconfigured the fob but still happens. Any...
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  Why has my Ford C-Max gone into limp home mode? 1 Apr 2015 (Ask HJ)
  I've recently replaced the clutch and DMF in my 2004 Ford C-Max 2.0 diesel. However, the car has now gone into limp home mode. Any idea why?
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  Leaky fuse box on Peugeot 207 19 Jan 2014 (Ask HJ)
  The ECU on my 2007 Peugeot 207 is throwing up warnings at random and switching lights and wipers on even when I'm not in the car. I’ve been told it could...
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  What are the advantages of K and N air filters? 22 Aug 2013 (Ask HJ)
  What are the advantages and disadvantages of a K and N Air filters on a 2005 Peugeot 307?
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  Central locking playing up 12 Jan 2013 (Ask HJ)
  I have a persistent problem my garage can't solve. They’re very good but this ones got them stumped can you help? When I turn on the ignition the central...
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  Loss of power 10 Jan 2013 (Ask HJ)
  It's a Vauxhall Vectra B 2.0DTI 16v. All was fine til the engine bay was washed. Now the engine management light comes on, Major loss of power, when cold...
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  Have I blown a fuse in my 2006 Ford Fiesta by connecting the battery in reverse? 28 Aug 2010 (Ask HJ)
  I have a 2006 Ford Fiesta. I tried to jumpstart it by connecting the battery the wrong way round. Now the car is completely dead. Do I need a new battery...
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  Do I need to have my Audi A3's pump module recoded after replacement? 10 Aug 2010 (Ask HJ)
  My Audi A3's ABS pump module has packed in. I got a used pump and module with the same numbers on as mine, but was wondering whether, if the part numbers...
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  Peugeot 206 misfires only brake is applied 4 Aug 2014 (Ask HJ)
  I have a Peugeot 206, which misfires when the breaks are applied. The car then has to be shut down and restarted for it to stop. The ECU, throttle body...
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  Nissan Tino - which chain cam? 4 Nov 2012 (Ask HJ)
  I have a '04-plate Nissan Tino, and I want to know what type of timing chain it uses? I have been told that there is two types, Which one does mine...
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  Porsche logging 'exceeded revs' from ECU 4 Sep 2012 (Ask HJ)
  I have owned several Porsches for more than 10 years and have always properly maintained them with dedicated Porsche garages and warranties. On renewing...