I've replaced the 2 door pillar switches probably half a dozen times. They're always breaking for some reason, even though I rarely use them.
Fortunately they're pretty cheap. You can get used ones from about £10 and brand new for less than £30.
I believe the part number for the ultrasonic switch is 4B0962109A
Brand new from the forum sponsor for £26.49 here:
http://www.ebay.co.uk/itm/Audi-A3-8L...-/172104053265
The boot release switch part number, for future reference, is 4B0959831A I believe.
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust