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• 00 1.1 - Citroen Saxo battery draining 23 Nov 2010 (Forum)
  I unpugged each engine connector in turn to try and locate the other end of the wires on this connector but no difference. I was just about to go for the dreaded ignition switch when I noticed a relay under the ECU. I struggled but eventually managed to unplug it and buzzed the wires to confirm they were the ones I was looking for and they were. I then buzzed the relay and found the normally open contacts were actually welded together and were buzzing when they should not have been.
• Ford Mondeo III (2000 - 2007) - 04 2.0 TDCi turbo vane actuator problem (P132A) 28 Apr 2009 (Forum)
  tid/787922/tp/1/ and http://www.fordmondeo.org/forum/showtopic.php?tid/788353/ If the actuator arm is disrupted by the sticking vanes, the ECU may flag up a fault in the actuator as a consequence. Any thoughts would be welcome? There are a few other forum threads on this matter if it helps? other links http://www.fordmondeo.org/forum/showtopic.php?
• Skoda Octavia II (2004 - ) - Both cars - first service. 14 Jan 2009 (Forum)
  They also greased all the hinges/locks, checked tyre pressures, inspected the car underneath and also checked for stored error codes in the ECU (none found), so not bad for the price paid. The Qashqai however is another matter. My local Nissan main dealer, who is situated less than a mile from the Skoda place quoted me £190 I asked what this involved and was told an "oil and filter change".
• Corsa 1.2 Vegas Starting Problems 10 Feb 2007 (Forum)
  Guess what - next morning, get in the car and it wont start! Vauxhall think there may be a problem with injector or ecu message regarding injector as there were previous fault codes but they have been resolved. Usual vauxhall prices £300+ vat no labour for each option. Anybody got any ideas. Seems intermittent and that would suggest electrics?
• Deposit on used car deal 14 Aug 2005 (Forum)
  We had hardly got a mile from the car lot when the car cut out. Any attempt to give it any throttle would result it cutting out with a bang and the ECU light coming on. (It was ok on the initial testdrive.) It was able to be restarted though. We immediatly drove the car back and demanded the bankers draft back. He gave it back begrungingly. We are giving him one last chance at fixing the problems, if he has not fixed it to our satisfaction by Thursday this week we will be walking away from the deal.
• Nearly new car running very badly 12 May 2005 (Forum)
  No fault codes were stored, so the dealer replaced the ignition module and plugs. No difference. Then the ECU, same again. To get to the point, the car has had 18 dealer visits in its 19 month life. Its had the above replaced, along with every engine-based sensor, but still no joy. My main problem is that nearly everytime the dealer has had the car, it performs without fault, never stores any codes, and so it comes back to me with a 'no fault' diagnosis.
• Doing it yourself!! 10 Jul 2003 (Forum)
  He did all of the things that most of us would, such as check the air filter, fit new plugs and HT leads and look for faults in the fuel system. It was all to no avail. It was suggested that the ECU was to blame and, as you will know, this item is far too expensive to replace in the vague hope that it could be at fault. He did the wise thing and borrowed one to try out. No joy. By now, he had to admit defeat and call in the cavalry.
• 
  Please help me with a major warranty problem following repairs to my Skoda Fabia. 4 Sep 2010 (Ask HJ)
  I bought a 2006-registered Skoda Fabia in December 2008. The car had 47,000 miles and was in good condition. At the time of purchase, I was given 12 months'...
• Astravan 1.7 DTI 16V Y17DT 2001 - Error code P1125 Y17DT astravan G orange warning l 16 Oct 2020 (Forum)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++ Ok had an eventful day today. replaced the MAF no change, replaced the boost solenoid on the back of the engine under the pump ecu, no change. The solenoid valve I fitted to the top of the engine that turned out to be the EGR valve, was in fact the rear boost lower solenoid valve, so that was a bonus. The pipe fitting on the old boost vlave must have been cracked as it came of with the pipe fairly easily.
• 2008 Ford Focus Mk2.5 Titanium 1.8 Duratec Petrol - 08 Ford Focus 1.8 Weird Revs/Idle No Codes But S 4 Sep 2020 (Forum)
  Tested the Alternator wiring as far as he could up to the main loom and there are no breaks. The alternator's 3-pin plug is getting a signal to and from the ECU too apparently. It's one of those SmartCharge things Ford is adamant is a good thing. He reconnected the alternator and the car's idle went mental, rising to 2.5K and more without touching the accelerator pedal.
• Ford Mondeo Mk3 - Tdci - Strange overheating problem, only at speed 4 Jun 2018 (Forum)
    - Coolant is not contaminated   - There is no white smoke coming from exhaust   - ECU Diagnostics confirmed that the temperature was apparently what the temp gauge was reading when it was overheating, so cant be dodgy electrical sensor.   - Cant really be the heater matrix as although it would cause only cold air, it wouldn't cause the overheating (I believe the matrix part of the cooling system junctions off from the main cooling system; so even if it was blocked, it wouldn't cause the coolant to stop flowing)   - There are no strange noises comuign from anywhere in the engine bay.
• Subaru Impreza 2.0 - performance flatspot 21 Sep 2016 (Forum)
  i have tried to reset the ecu, but it will work better just for about 2 days and then go back again to working horribly. i have been to 5 mechanics . they said the changing of the rims will not cause that, just coincidence. i have changed new fuel filter with regulator. also the fuel pump. we put a gauge to check the psi of the pump and it held up fine- no problems.serviced the air filter. i changed the knock sensor. i replaced the air flow sensor. i serviced the injectors and throttle body four times at different mechanics. i changed the timing belt and tension-er and pulleys - . i changed the engine and transmission oils. i changed the spark plugs. sometimes on the highway the 4th gear will take long to go in and when i try to kick down, it will not and the same gear will run. the 1st and second gear will sometimes go in with a hard buck.
• subaru impreza 2006 2.0 R - subaru impreza 2006 2.0R engine PROBLEMS !! 19 Sep 2016 (Forum)
  hi, i have a 2006 impreza 2.0 r engine . i bought the car from the previous owner in may 2015. for 1 month the car worked well. as soon as you touch the gas pedal it will shoot off, acceleration great and top speed about 190 km. as soon as i changed the rim and tyres it died. it had 16's and i put 17's, but the manual said i can make that change. it started to flat spot bad and go dead. it will crawl up small hills gas pedal to board. on flat roads as well, flat spot, dead, no acceleration. then suddenly it will take off again with a spurt but will soon die down again. on the highway 3rd and 4th gears no problems. it will fly. but it never worked again as it did the first month.i have tried to reset the ecu, but it will work better just for about 2 days and then go back again to working horribly. i have been to 5 mechanics . they said the changing of the rims will not cause that, just coincidence. i have changed new fuel filter with regulator. also the fuel pump. we put a gauge to check the psi of the pump and it held up fine- no problems.serviced the air filter. i changed the knock sensor. i replaced the air flow sensor. i serviced the injectors and throttle body four times at different mechanics. i changed the timing belt and tension-er and pulleys - . i changed the engine and transmission oils. i changed the spark plugs. sometimes on the highway the 4th gear will take long to go in and when i try to kick down, it will not and the same gear will run. the 1st and second gear will sometimes go in with a hard buck.when i apply brakes to stop, while slowing down i can feel the hard buck from the engine or there abouts as the car comes to a stop.i scanned the car at 6 mechanics!
• 
  Have I void my Fiat warranty? 16 May 2016 (Ask HJ)
  I was driving my fiat 500 Abarth recently. As I pulled out of a junction on to a busy main road and changed gear my vehicle revved very high and jumped...
• 
  Timing chain failure on Skoda Octavia 1.2 TSI - what are my options? 15 Feb 2015 (Ask HJ)
  I bought a used (2011) Skoda Octavia 1.2 TSI from a dealer in 2012. Two weeks ago, parked normally on (flat) drive in evening. Following morning, engine...
• Peugeot 106 1997 1.1 - MOT - CO 2nd fast idle, & idle speed too high 21 May 2014 (Forum)
  Should I be overly concerned about the "003) Exhaust engine idle speed too high [7.3.D.2]" as Haynes says this is controlled by the ECU. Could the exhaust leak be a cause of this? (the leak is a crack about 3mm on the front exhaust pipe) My plan of action.... I have gun gummed the front pipe to stop the leak.
• Focus 1.8 TDCi 2001 - 9318 Fault code - occasional engine stop and rough 1 Nov 2012 (Forum)
  On my car it appears to be attached to the intake manifold so that looks like a tricky  job but if someone can tell me it's easy enough I will do it. Replacing the CAM position sensor and updating ECU software may be a good idea. Any other ideas?  I would really like to know the root cause here -a  dirty EGR valve does seem possible expecially considering the random nature of the problems....but I really have no idea...
• Ford Mondeo TDCI - 2006 Mondeo TDCI EGR Valve - Help Please!!! 29 Oct 2012 (Forum)
    Having cleaned the valve and having had the car in with a Ford dealer for a week now, I am pulling my hair out - Ford says it can find no faults with the car.  They remapped the ECU and while the (always black) smoke is significantly less than before, it is nevertheless present, particularly on the motorway, with small depressions of the accelerator in 4th and 5th gear.  I cleaned out the existing EGR valve in accordance with all of the blogs (but not the mainfold itself) and have had the fuel filter replaced.
• Ford Mondeo - 2001 Mondeo 2.0tddi - various/related problems? 6 Nov 2010 (Forum)
  Hi, our car has recently developed a problem/ several problems that have stumped us. We've always been a bit conscious that the timing isn't quite as we'd expect it to be, ecu has been reset which solves the problem but only for a few weeks/months.  Last week the car started bunny hopping away from lights having been running fine for the past hour.  We were only a few hundred yards from home luckily.
• 306HDi-Knocking after new fuel pump 13 Dec 2006 (Forum)
  Oh I think this is a coincidence but think the battery was low before breakdown as the morning and evening before it was slow to turn over and the speedo/rev counter went round to 110/5000rpm on starting and all the segment of the mileage display lit up - I assume because of low voltage. I'm wondering if the low voltage as reset the ECU or anything and the car needs 're programming?' which is causing the coughing/knocking noise. Much appreicated Mike.