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I know that the door pump in the 2000 Audi a4 is located in the trunk right behind the passenger side tail light.
Its in the trunk on the right under the rug.
It's mounted on the Trunk Lid Latch.....
If not there, try looking in the trunk. On the trunk arm.
look at manuel or on hinges in trunk
under the trap door in the trunk
There is an access door in the trunk for the fuel pump. You can change it from there.
The battery is located in the trunk on the right side. Remove the upright 1/2 panel and then remove the trap door panel.
Under the panel with the keyhole on the trunk, there is a handle to open it. If that doesn't work, in the driver side door, there is a button that shows a picture of the trunk opened. Press that and the trunk will open.
Check fuses
how do you remove audi tt 2010 door mirror unit
I have a 2000 zts and I have noticed that when the door is locked , the trunk button won't work. Try that. I know it seems simple, but it actually got me quite frustrated before I figured it out!