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Thread: MOT fail, Co2

  1. #1
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    Default MOT fail, Co2

    Hi.
    Had my Signum 2.2 direct in with vx for an MOT this week and it failed.
    A few issues I can resolve but 1 I am baffled with.
    It failed on emissions, Co2 only. 2.9 on first fast idle and 3.7 on second fast idle.
    They said they would need to run a diagnostic which would cost me £42.
    Thats steep to tell me what the problem is.
    I phoned kwik fit to compare the price of this and they told me they change the cat when a car fails on Co2.
    Sometimes they use a fuel additive instead and this can clear the problem, the additive costs £20. Will that work?
    What is my best way to get this done quick so I can get the MOT to pass?

  2. #2
    Ex Vec-C Admin & Founder GARY3306's Avatar
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    I would change the coolant temperature sensor first. Cheap and if it fixes it, you've saved a packet on the alternatives.
    [SIGPIC]VX<font color=Red>R</font> with added Courtenay <img src=https://www.vectra-c.com/forum/images/smilies/biggrin.png border=0 alt= title=Big Grin class=inlineimg />

  3. #3
    Regular Member AntSSSS's Avatar
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    Vehicle : Vectra Estate

    Trim : SRI

    Engine : CDTI 150 (Z19 DTH)

    Year : 2008

    Mileage : 100k

    Default

    Quote Originally Posted by GARY3306 View Post
    I would change the coolant temperature sensor first. Cheap and if it fixes it, you've saved a packet on the alternatives.
    plus a clean air filter and fresh plugs.

  4. #4
    Regular Member markj23's Avatar
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    normally oil and filter air filter change will bring down the Co2 a lot all it is, is the unburnt mixture so if the air is clean and the oil is clean you get better mixture

  5. #5
    Ex Vec-C Admin & Founder GARY3306's Avatar
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    Quote Originally Posted by AntSSSS View Post
    ......... and fresh plugs.
    He may be on a while trying to change plugs on a 2.2 direct
    [SIGPIC]VX<font color=Red>R</font> with added Courtenay <img src=https://www.vectra-c.com/forum/images/smilies/biggrin.png border=0 alt= title=Big Grin class=inlineimg />

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