I've trawled through loads of threads about boot sensors issues but can't find the issue I'm having. My A3 insists on the DIS that the boot is open, when it's not. Now before you all shout I know its common but the twist here is it's NOT setting the alarm off. Locks fine with the central locking, restart the engine and same flashing boot open picture but never triggers the alarm. A few months ago the wiper was buggering around so stripped it down, cleaned it up and cleaned the boot locks etc. Result wiper works and the boot light, which I'd been too lazy to get a bulb for, started working again. Skip to this week, annoying light, wiper won't work because it thinks the boot is open but no alarming. I'm happy about the lack of alarm but confused about what to replace. If it's the boot microswitch that's knackered why isn't it tripping the alarm?