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  Is it illegal to remove a DPF? 16 Oct 2013 (Ask HJ)
  I have a BMW 118 ES Coupe, which I purchased new in 2011. I love the car and would like to keep it over the long term, but I would like to try and avoid...
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  Rover 45 has died and won't start 15 Sep 2013 (Ask HJ)
  I bought a Rover 45 yesterday and as I was driving home the revs were bouncing up when parked at lights. Today, the engine light came on and the car died...
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  Issues with Fiat 500 Diesel 29 May 2013 (Ask HJ)
  I have a Fiat 500 Diesel car, which is currently having white smoke coming from the exhaust. It is also over revving and the DPF warning light has come...
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  What is causing an engine fault alert on our Renault Scenic? 25 May 2013 (Ask HJ)
  My Renault Scenic has started to intermittently display the warning message on the dash "Check Injection" with the service light. I've checked out the...
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  Fuel economy drop on my 3 Series - why? 1 May 2013 (Ask HJ)
  I have owned an 07 BMW 320D Sport Tourer Auto from new. Until last Autumn, I was averaging 37mpg. This has fallen over the winter to 24mpg in town and...
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  Misfiring, smoking E46 BMW 320i 8 Apr 2013 (Ask HJ)
  My E46 started with a misfire then loss of power, uneven idle, white smoke and later it flooded cylinder 4 with fuel, disabling the spark plug and allowing...
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  Engine won't turn off in our SEAT Leon 5 Feb 2013 (Ask HJ)
  My wife has a 2009 SEAT Leon FR Petrol. There is an intermittant fault in that when the ignition is turned off and the key removed the engine will continue...
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  Citroen C5 lacking power 13 Jul 2012 (Ask HJ)
  My Citroen C5 is lacking power. The anti polution light comes on, engine power dies to next to nothing so I turn the engine off for a few seconds and turn...
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  Buying a 2007 Merc E280 CDI 30 Apr 2012 (Ask HJ)
  My wife has the option of buying a 2007 Mercedes 280CDI from her company for £13,000. The car has covered 50,000 miles and we need the seven seat carrying...
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  Dedicated foreigner to fashion 5 Oct 2011 (Ask HJ)
  As a retired former senior executive in the car industry, the most refreshing aspect of your column is the even-handed way you dispense advice on customer...
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  I'm having a fuel system problem with my Peugeot 306 - can you help? 12 Sep 2010 (Ask HJ)
  I am having a few problems with my 306. The car will not idle. The ECU is reading: 'Permanent fault low pressure pump supply.' 'Intermittent fault:...
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  I want to buy a Volkswagen Golf V but am worried about the ESP fault - how do I know if it's been fixed? 9 Sep 2010 (Ask HJ)
  I'm going to take a look at a 56-reg MkV Volkswagen Golf TDI at a local independent dealer at the weekend. I've had quick browse on here and found a lot...
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  Why won't Volkswagen contribute to repairing an ESP/ABS fault on my EOS? 26 Aug 2010 (Ask HJ)
  We have a Volkswagen Eos Sport 2-litre TDI purchased in March 2007. The vehicle is used as a second car and has done 19,000 miles only. The ESP fault light...
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  Why is my 2003 Vauxhall Zafira losing power when the engine management light comes on? 10 Aug 2010 (Ask HJ)
  We have a 2003 Vauxhall Zafira Design diesel which we bought secondhand about three years ago. For some time, we have had problems with the management...
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  Is my Nissan Micra's engine problem due to an MAF fault? 3 Aug 2010 (Ask HJ)
  I have a 2001 Nissan Micra K11 1.0. I've been experiencing really poor engine performance recently. It would start easy enough and idle OK, either cold...
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  Why is my Ford Mondeo TDCI producing blue smoke? 30 Jul 2010 (Ask HJ)
  I have a 2.0-litre 2002 Ford Mondeo TDCI 130BHP and had a message saying 'P2339 Cylinder #4 above knock threshold' on the ECU diagnostics check. The car...
• Peugeot 206 hatchback (1998 - 2006) - 06 1.6HDI FAP DPF Removal Experiment 16 May 2010 (Forum)
  who can fabricate up a straight through pipe relativley cheaply. The question which needed answering was will the ECU go into fail mode if there is no DPF in the exhaust pipe, and prevent the car from working properly. My hunch was that it should be OK, because the differential pressure sensor
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  Thank heavens for small Mercs 23 Jan 2010 (Ask HJ)
  After two years of research, arguing, test-driving and reading, my wife and I have at last agreed on one car that will suit us both, for some town driving,...
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  Fishing chips 27 Jun 2009 (Ask HJ)
  I have a BMW 123d and am looking at ways to further decrease my fuel consumption as I drive approx 100 miles per day, mainly all motorway sat on cruise...
• Peugeot 306 (1993 - 2001) - 2000 2.0 HDI With Zero acceleration 9 Mar 2008 (Forum)
  tone changed. I put my foot down to accelerate and it had no power then the ecu warning light came on. It starts and revs when stopped perfectly. It is only when the engine is under any load it just won't rev. It is like the throttle is only open a little or it's not getting any fuel. So I took