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Audi A3 2002 erratic fuel gauge when cold

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  • 29-08-2005 4:55pm
    #1
    bannerinDublin
    Closed Accounts Posts: 41 ✭


    I have a 2002 audi a3 1.9tdi, and when I start it up first thing in the morning when its cold the fuel gauge does 1 of 3 things. It either reads empty and fuel warning light comes on, reads full or moves over and back rapidly in a window wiper manner. All of the above behaviours stop when the car warms up and a correct reading of the fuel is then given.

    Any ideas of whats causing this or a solution?

    Thanks


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    #2
    murphaph
    Registered Users Posts: 19,021 ✭✭✭✭murphaph


    AFAIK there's a fuel temperature gauge in the tank as well as the sender unit for the fuel level. Where are you located mate? PM me if you're able to get to D15 and I'll scan the instrument cluster for you. There might be an error code pointing straight to the dodgy sensor, intermittent loose connector etc.


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    #3
    stratos
    Closed Accounts Posts: 1,038 ✭✭✭stratos


    It could be the dash panel voltage regulator, usual source of intermittent scatty readings, or more likley a loose\corroded\damp connection at the tank end of the fuel level sensor.


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    #4
    bannerinDublin
    Closed Accounts Posts: 41 ✭bannerinDublin


    murphaph: Thanks for the offer but im very busy with work for the next couple of weeks. I might give you a shout then if thats ok?

    stratos: Yes that was my theory also. I was checking the fuses over the weekend and all are good but what i realised was that in the morning when I start up the car and for instance the fuel gauge reads empty, if i plug out the fuse for the instrument cluster and plug it back in then the gauge give a correct reading instantly.

    My gut feeling is its a problem with the fule sender unit in the tank but the fuse test i did has confused me a little now.

    murphaph: Would your scan be able to detect whether its a fuse or connection problem or a knackered fuel sensor?

    Thanks for all your help guys, I appreciate it.


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    #5
    murphaph
    Registered Users Posts: 19,021 ✭✭✭✭murphaph


    bannerinDublin wrote:
    murphaph: Would your scan be able to detect whether its a fuse or connection problem or a knackered fuel sensor?
    To be honest I never know what's going to show up on a VAG-COM scan! Hopefully it'll point to something directly or something we can google and someone else has had that error code and wrote about the fix. If it's a loose connection it will record an 'intermittent' fault. The thing about pulling and replacing the fuse sounds very weird. I have a factory repair manual for the B5 passat and I think there my still be parts (ie error codes) in common that can be checked there. There's a wealth of info on VAG-COM error codes on the net-you just need to get the code out of the car! The instrument cluster can be tested (the needles all move to set positions and all the leds and lcds come on).


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