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Thread: MAP sensor

  1. #1
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    MAP sensor

    Hi,
    I have just had a fault code come up, I took it to my brother's work place and had a fault reader plugged in. After a few clears and re-reads the guy (not my brother) said it was a problem with the MAP sensor which needs replacing. He said that this is quite a common problem.
    No worries, I went to the parts place and shelled out 75 for a new MAP sensor.
    Now before going to the parts place the chap cleared the code, and since it has not come back on .

    Is this as stated a common problem?
    I have done a search on this and it hasn't brought back a load of relevant threads.
    So I'm thinking

    a) was there a gremlin in the sensor? and now is back to norm and I wasted 75

    or

    b) This is common as muck and the fault code will be back in a weeks time.

    Just looking for avice as to wether to get the part replaced as a precaution as I already have it and it won't cost the earth as little bro will fit it for free. Or ghet my money back

    Thanks
    Gareth

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  3. #2
    <tuffty/>'s Avatar
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    Depends on the condition causing the fault which should have been part of the fault code... just to say its a faulty MAP sensor is a bit ambiguous as without knowing the reason why it faulted (typically included with the fault code) then you won't know if its the cause or the victim of another fault.

    Was it definitely the MAP rather than the MAF?? the 2 are very different. MAF problems are common, MAP sensor less so I believe.

    More info required with this one methinks...

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    Its was def the MAP as I thought he said MAF and was expecting this to be wrong. So i confirmed the P.
    He said that the MAP would also be cheaper than the MAF and so I was quite happy to be on my merry way to get a cheaper fix.
    When driving the car with the light onh it didn't seem to be very .. broken? perhaps a little unresponsive when booting it but apart from that nothing to worry about, perhaps wait and see.
    A colleague of my brother has a new fangled snapon doo dad so I think i'll get it plugged into that should the light come back on.

  5. #4
    <tuffty/>'s Avatar
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    VAGCOM for the win to be honest. A tool that just shows a component has faulted isn't much use on these cars as there are numerous reasons why a fault of a component could occur.

    For example...
    http://wiki.ross-tech.com/index.php/17566/P1158
    http://wiki.ross-tech.com/index.php/17563/P1155/004437

    Need to know the fault code to be able to work out if it really was the MAP sensor at fault..

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    Well now. The light came back on so I took it back to the brother's garage and got it plugged in. Same fault code. Iso/ something. Running too rich.
    We decided to look for the map senor on the advice given and eventually found it (i say we) in between the washer bottle and the head light. He took the sensor off (two little buggers of screws) The ploastic casing that protected the metal contacts had broken and there was water water everywhere. This has coroded (SP) the contacts. Changed the sensor and all is right in the world. It finally seems to be pulling as hard as I expected (other problems have prevented this in the past.
    So for now
    Lesson to self be more careful when adding washer fluid and avoid pouring it all over expensive and akward sensors.

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    running too rich? and map sensor?

    you thinking lambda?
    is his code reader an acme code reader? what p code?
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    I have no idea! It was either too rick or too lean. And my brother though it would have been the lambda at 1st but I think that his colleague was right. it seems to have fixed the issue and now she pulls harder that ever. I think the turbo is finally sucking hard as I heard it for the first time just after leaving the garage and though air was leaking somewhere. Also when she was cold it was running like a bag of s**t but now that seems to be cured.
    All I really know Petrol + spark + air = forward. or backwards if your being picky.

 

 

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