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Motors Anyone put a diesel through the new harsher MOT?

Discussion in 'General' started by Mr Meltdown, 17 Jul 2018.

  1. Mr Meltdown

    Mr Meltdown Minimodder

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    How did it go?
     
  2. RedFlames

    RedFlames ...is not a Belgian football team

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    Know of 2 diesel cars belonging to mates that got MOT'd recently - one sailed through the other failed hilariously...

    Though fwiw i don;t think the latter was down to the stricter MOT.
     
    Last edited: 17 Jul 2018
  3. David

    David μoʍ ɼouმ qᴉq λon ƨbԍuq ϝʁλᴉuმ ϝo ʁԍɑq ϝμᴉƨ

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    When did it change?
     
  4. GeorgeK

    GeorgeK Swinging the banhammer Super Moderator

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    20th May. Basically if the car has a DPF and the tester can see smoke of any colour coming from the exhaust it gets a major fault which means the car fails but can at least be driven (amongst other changes)
     
  5. Mr Meltdown

    Mr Meltdown Minimodder

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    Here's the brief overview: https://www.gov.uk/government/news/mot-changes-20-may-2018

    A bit more info: http://www.autoexpress.co.uk/car-ne...anges-2018-new-failure-categories-take-effect

    You lose any existing mot when it fails now so taking it in early has no benefit at all, plus if you drive it away with any dangerous fails you can be prosecuted if stopped.

    Mods to exhaust and headlights as well as some remaps can cause fails.

    So people with modded TDIs like me will have a tougher time of it.
     
  6. wyx087

    wyx087 Homeworld 3 is happening!!

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    Wait what? So greedy garage now get to fail it and you are forced to have the car repaired there?
     
  7. Sentinel-R1

    Sentinel-R1 Chaircrew

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    Anyone who has had a DPF or EGR delete will be significantly out of pocket as they'll need to be reinstated before the MOT. Instant fail if not present, but factory fitted.
     
  8. legoman

    legoman breaker of things

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    Correct, I believe its meant to flag up on the MOT if the vehicle should be fitted with one, so removal or tampering with one (usually weld marks) will fail not only that but the emissions wont match anywhere near the expected.

    One amusing thing, if someone removes the EGR but not the DPF, it actually causes more problems as part of active DPF regen usually triggers the closure of the EGR to increase the exhaust gas temps, an EGR delete means it can only passive regen so if they do a lot of short trips or interrupt the passive regen to many times they will end up having to replace the DPF unit.

    Partially this is with the Nissan Quashqui seems to have lots of DPF issues, a small Diesel unit which stuggles to make the heat required (500-600c) and due to the type of vehicle is often found inner city at low speed of doing very short journeys. This loads the DPF and is often ignored means it hits 95% full and the car drops to limp mode until it is replaced, above 95% its usually considered replacement is required as the soot build up is too great.
     

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