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Thread: mot question

  1. #1
    Regular Member SRimonkey's Avatar
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    Default mot question

    lads i`m a bit thick lol,can someone explain what a MAF sensor is and why a car SHOULD fail its mot if this sensor is reading slightly too high,just been to pick the astra up from its first mot,and been told this,emissions are perfect tho

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    Regular Member r.bailey63's Avatar
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    Fairly sure it isnt directly part of the MOT.

    MAF is the Mass Air Flow Sensor.

    If emissions are ok cant think why they have failed it.

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    [Ex]Admin Duncan's Avatar
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    The MAF is one of the controls/sensors for the fuelling of the car and if it's faulty you can end up running with incorrect fuelling, so if it ran rich then that would affect your emissions. But if the emissions are fine then there's no worry.

    Also, to actually test the MAF involves plugging in Tech 2 type diagnostics to see what readings it's giving and that certainly isn't part of an MOT (plugging in the Tech 2).

    Cyncical side of me suggests someone either doesn't know what they're talking about, or is trying to get you to replace a part that doesn't need to be.

    So have they actually failed the MOT for that reason? If so then firstly ask them since when did the MAF become part of the MOT requirements and what exactly makes them think it's faulty.

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    Regular Member SRimonkey's Avatar
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    Quote Originally Posted by r.bailey63 View Post
    Fairly sure it isnt directly part of the MOT.

    MAF is the Mass Air Flow Sensor.

    If emissions are ok cant think why they have failed it.
    who said they failed it? lol my uncle`s the tester he just told me of a problem,said it was reading something like 117 if that makes any sense to anyone but the other bloke woulda failed it

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    Regular Member SRimonkey's Avatar
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    not worried just wanted to know what it is,bein all responsible now i got kids, jus makin sure it wasn`t nothin important

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    Regular Member r.bailey63's Avatar
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    If you dont get a good explanation as to why they have failed the car i would contact VOSA directly, they are usually fairly sympathetic in situations like this. Failing that goto a different MOT station, try IN n OUT in Wednesbury they dont do MOT repairs so have nothing to gain from failing the car.

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    Regular Member SRimonkey's Avatar
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    he passed it m8,just wondered what the maf thing was,he`s always sorted my cars out even if somethin needed doin he`d pass it then sort it out 4 me

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    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by SRimonkey View Post
    not worried just wanted to know what it is,bein all responsible now i got kids, jus makin sure it wasn`t nothin important
    Worst it's going to do is make the car run a bit rough/lumpy if it is faulty. Nothing major but you don't want to leave it too long if it does start to play up especially if it causes overfuelling.

    They're a doddle to change, just not the cheapest of parts so you want to be sure it's faulty before you go that route.

    As for the other guy who said he'd have failed it, I'd ask him (out of curiosity) on what grounds!

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    Regular Member SRimonkey's Avatar
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    i`ll price one up,an get it changed,my uncle`s pretty good 2 me he even passed my corsa an that thing ran so rich once midland performance had it on the ramps that petrol came out the exhaust lol and sailed thru emissions with a de cat pipe

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    Ex-Staff Full Member John LE's Avatar
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    Default

    When it comes to emmisions there is a set limit and no discretion comes into it. Paramateres are set by vosa, Labda Sond has to be between 0.97 and 1.03 ( i think) and CO2 has to be between 0 and 200ppm.
    Can't remember off the top of my head what the other one is but if its above limits it should fail, no ifs or buts

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