I have a 53 plate A3 5 door quatro TDI and the alarm has this evening started going off every 5 minutes. I have checked all doors and boot are closed properly, blown any dust from internal sensors and even tried turning off internal sensors. At the moment I have disconnected the battery as to not disturb any one in the night. I had a 99 prefacelift a3 which also did this but the alarm horn didn't work so idn't matTer as much, turned out to be a faulty alarm sensor on the passesnger door, on this car when I lock the car the passenger door alarm LED flashes frantically for about 20 seconds after locking. Any ideas what to do? Last time I had a vagcom wizard diagnose the issue and he just turned off the door alarm sensors. Unfortunately I have just moved and have no internet so access is limited on my phine.