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Thread: Is this why me fuel cap door doesn’t work?

  1. #1
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    Is this why me fuel cap door doesn’t work?

    https://www.dropbox.com/s/rb4patsjgx...%20am.jpg?dl=0


    Or perhaps the previous owner broke the plastic bit off because the unlocking function wasn’t working?
    Last edited by OldSchool; 11-10-2017 at 12:53 PM.
    Current: 2001 A2 TDI Grey
    Old: 2003 A2 1.6 FSI Cobalt Blue

  2. #2
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    I would say it's been broken off on purpose to get over the dreaded micro switch problem. I fixed ours at the weekend and now it works a treat.

  3. #3
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    Quote Originally Posted by Kleynie View Post
    I would say it's been broken off on purpose to get over the dreaded micro switch problem. I fixed ours at the weekend and now it works a treat.
    I had a suspicion something like this might be the case...

    Is this the switch in the door frame that one presses to unlatch the fuel door?
    Current: 2001 A2 TDI Grey
    Old: 2003 A2 1.6 FSI Cobalt Blue

  4. #4
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    Quote Originally Posted by OldSchool View Post
    I had a suspicion something like this might be the case...

    Is this the switch in the door frame that one presses to unlatch the fuel door?
    No, it is the micro switch in the door lock mechanism that is know to fail. The door doesn’t register as open because of that. If the car doesn’t sense that the door is open the fuel flap switch does not work.

    Steve B
    White (non-Factory) TDI 90 - BOSE, MFSW, DIS, cruise, Headlamp washers, rear cupholders, Votex style rear spoiler, Heated (twist) leather, double DIN, DIS, rear Power Socket, false floor, Auto headlights, LED interior bulbs, 18" x 8" - 9 Spoke "Sport" alloys on new 215 35 18 Yokohamas, Auto dimming mirror, heated door mirrors, 4 electric windows, Front fogs.

    VCDS and Key programming service, Votex Jacking point covers (3d copies) available.


  5. #5
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    The switch you mention in the door frame is activated when the drivers door is open. The microswitch is in the drivers door, its this that tells the car that the door is open, it also activates the interior lights and the DIS with a picture of the car with the door open (if you have DIS). The microswitch is most likely at fault, it's fairly easy to get to but takes time to find the fault, mine was working but the cam that drives it was not pushing the switch enough to make the circuit, the cam is driven by the door lock mechanism. It sounds complicated, but it's a simple system.
    I suspect your interior lights do not come on when the drivers door opens? If so your microswitch in the door needs attention.
    Project - May 2003 A2 1.4i Sport, Azur Blue, black sports seats with lumbar, open sky, 17" 9 spoke wheels.
    Daily driver - July 2015 BMW 535d GT M Sport, Sophistico grey/ivory leather comforts, 21" wheels, head up display and 10 speaker Gladen audio install.

  6. Users that liked this post:

    Birchall (11-10-2017)

  7. #6
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    Steve beat me to it!
    Project - May 2003 A2 1.4i Sport, Azur Blue, black sports seats with lumbar, open sky, 17" 9 spoke wheels.
    Daily driver - July 2015 BMW 535d GT M Sport, Sophistico grey/ivory leather comforts, 21" wheels, head up display and 10 speaker Gladen audio install.

  8. Users that liked this post:

    Birchall (11-10-2017)

  9. #7
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    Quote Originally Posted by Kleynie View Post
    The switch you mention in the door frame is activated when the drivers door is open. The microswitch is in the drivers door, its this that tells the car that the door is open, it also activates the interior lights and the DIS with a picture of the car with the door open (if you have DIS). The microswitch is most likely at fault, it's fairly easy to get to but takes time to find the fault, mine was working but the cam that drives it was not pushing the switch enough to make the circuit, the cam is driven by the door lock mechanism. It sounds complicated, but it's a simple system.
    I suspect your interior lights do not come on when the drivers door opens? If so your microswitch in the door needs attention.
    Ah... ok ... pretty sure my lights turn on when door opens... or maybe it’s when I use key fob button to unlock it...

    I’ll double check...
    Current: 2001 A2 TDI Grey
    Old: 2003 A2 1.6 FSI Cobalt Blue

  10. #8
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    it can also be the solder joints in the door lock assembly, I have had a few A2's were the interior light did not come on when the drivers door was opened (fuel flap would not open either)
    I actually bought replacement micro switches, took out the door lock assy (2 hour job) and checked the micro switch with w DVM, it was perfect, further investigation revealed micro cracks in the solder joint of the main lock connector to the circuit board inside the lock. Reflowed the solder joints using leaded solder - result was the lock was perfect when refitted into the car

    I'm not saying it will be the solder joints, as it could be the micro switch, but as the lock is such a MITA to remove and refit I always reflow the joints now just in case. The micro switch is easy to check with a DVM

    Cheers,
    Paul (Depronman)
    1.4 TDI 2001 287,347 miles and still going strong

  11. Users that liked this post:

    Birchall (11-10-2017)

  12. #9
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    Quote Originally Posted by OldSchool View Post
    Ah... ok ... pretty sure my lights turn on when door opens... or maybe it’s when I use key fob button to unlock it...

    I’ll double check...
    Yes, the interior lights come on when you unlock the doors.
    If the milometer and date in the dash don’t light up when you open the driver’s door. Or if the door open warning doesn’t light up then your problem is within the door lock mechanism / wiring..

    Steve B
    Last edited by Birchall; 11-10-2017 at 10:37 PM.
    White (non-Factory) TDI 90 - BOSE, MFSW, DIS, cruise, Headlamp washers, rear cupholders, Votex style rear spoiler, Heated (twist) leather, double DIN, DIS, rear Power Socket, false floor, Auto headlights, LED interior bulbs, 18" x 8" - 9 Spoke "Sport" alloys on new 215 35 18 Yokohamas, Auto dimming mirror, heated door mirrors, 4 electric windows, Front fogs.

    VCDS and Key programming service, Votex Jacking point covers (3d copies) available.


  13. #10
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    Ok guys, I ran outside and just checked... neighbors already think I’m crazy ha ha...

    I used key fob to unlock car and of course lights came on...

    Waited short while for lights to fade off...

    Then opened driver door and no lights turned on... also miles meter and date didn’t light up but I recal them working before... I think this was when I turned engine off with key but left key in ignition so radio was on too...

    Anyway, the rear DooR DOES turn on the lights... how funny is that?

    So can we safely conclude that my drivers side micro thingy is broken?
    Current: 2001 A2 TDI Grey
    Old: 2003 A2 1.6 FSI Cobalt Blue

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