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S3 coolant temp sensor

Discussion in 'A3/S3 Forum (8L Chassis)' started by s3deano, Nov 13, 2009.

  1. s3deano
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    s3deano New Member

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    [Nov 13, 2009]
    hi guys, Ive had the car in the garage today due to my engine light being on, They said its showing coolant temp sensor at fault.

    Any of u guys had this problem?

    thanks Dean
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  3. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Nov 13, 2009]
    Do a search mate, the temp sensor has been covered to death.
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  4. s3deano
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    s3deano New Member

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    [Nov 13, 2009]
    Will do cheers pal.
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  5. AwesomeSarah
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    AwesomeSarah Member

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    [Nov 14, 2009]
    Very common issue
    This is due to it being able to alter the fuelling
    It registers the engine temp and then the fuelling is altered , a bit like the auto choke
    It is common and if left can cause an issue with the cat
    059 919 501A is the new part number for them
    Such a common issue they superceeded the part number
    It is now a 4 pin green sensor instead of the 4 pin black
    Sarah
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  6. barters3
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    barters3 Member

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    [Nov 14, 2009]
    i have been experiencing similar symtoms.
    would somebody be able to describe where the temp sensor is and how to change it.
    this would be much apreciated.
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  7. ianysm
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    ianysm Active Member

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    [Nov 14, 2009]
    Does it affect the way the car runs? Lumpy idle, over revving etc?
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  8. barters3
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    barters3 Member

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    [Nov 15, 2009]
    I wouldnt have said that it affects the idling particularly. Its just once its up to temperature it wil drop right back down to about 60 degrees when driving along.
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  9. The Doctor
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    The Doctor Well-Known Member

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    [Nov 16, 2009]
    Had this replaced on my 2003 S3 about 2 months ago. Engine light came on, took it to C&R in Nottingham who Vagcom'd it and identified the problem as the coolant temperature sensor. Made no real difference to the way the car ran, but I guess it'd affect the fuel mixture settings if it thinks it's running hotter/colder than it actually is.

    Anyway, £45 quid & all done in 15 mins over a proper coffee in a proper mug. Replaced the standard black one with the green one & hey presto, fixed!
    #8

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