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Strange NCT Experience with BMW 520D

  • 02-08-2014 6:13pm
    #1
    DublinWriter
    Registered Users, Registered Users 2 Posts: 9,560 ✭✭✭


    Brought my 08 BMW 5 series for its second NCT today (last was two years ago).

    When the tester came out he told me that it failed because the ABS and Steering Lock lights were permanently on. WTF? They weren't on pre-exam.

    Got in the car and tried to drive it. All the diagnostics lit up like a Christmas-Tree. System failures coming up - everything from the brake control, safety belt detection, brake systems plus the power steering had failed, it was driving like it had two flat tyres at the front.

    Went back in. Original tester came out, checked the car, went back in, observed him and some other guys doing much shrugging and pointing at each other in the test bay from the public area.

    He got his supervisor who went out and proceeded to 'dry-turn' the wheels when stationary going 'car fine! car fine! steering no problem!' whilst crunching the tyres.

    Yet another supervisor came out, told the first supervisor to print out a 'pass' certificate and told me that because of all the control systems on the car, the tests on the roller had triggered a lot of the internal diagnostic systems.

    WTF? So I drive off, and lo and behold all is ok. All the warnings stop and I've got power steering again.

    But this didn't happen two years' ago during the first NCT.

    Did they forget to put my beemer in diagnostic mode? Totally confused.


Comments

  • #2
    ShanE90
    Registered Users, Registered Users 2 Posts: 239 ✭✭ShanE90


    Same happened me when being dyno'd last year I think its because the rear wheels are rotating and the front are stationary, the ABS assumes a fault because no rotation is detected, turned car off and on again...problem sorted!


  • #3
    Voodoomelon
    Registered Users, Registered Users 2 Posts: 9,661 ✭✭✭Voodoomelon


    Rolling roads and NCT ground roll bars can trigger ABS/traction control lights on BMWs. Turning the car off and/or driving for a mile or so will get the car back to normal. Strange you lost power steering too though along with safety belt errors, but I imagine they're all related.


  • #4
    bazz26
    Registered Users, Registered Users 2 Posts: 51,360 ✭✭✭✭bazz26


    Sounds to me like the car's ECU recalibrated itself.

    Similar thing happened my car (non BMW) when I had it remapped and dynoed, dash was lit up a Christmas tree. Drove it a few yards and it sorted itself out, not a peep since.


  • #5
    kona
    Registered Users, Registered Users 2 Posts: 7,525 ✭✭✭kona


    Is the car fitted with a lsd?


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