Audi A4 Avant - scout1
I bought an Audi A4 Avant (98, R) in April and have been very happy with it so far. . . . . . but now two things;

1. the A/C display panel has gone a bit wonky and
2. the alarm has started going off (at night only!!) for no reason.

I think these issues may be related and will visit a garage ASAP. It appears that I cannot lock the car without activating the alarm/immobilizer - so my only option is to either, look forward to getting up every hour or so to turn it off (and look forward to getting lynched by the neighbours) or leave the car open. Any other A4 owners have similar experience?
Audi A4 Avant - Stuartli
Unless you bought it privately, it's presumably still under warranty?

Even the basic used car warranty is for three months.
Audi A4 Avant - Ivor E Tower
If it has the standard VW group alarm - lock the car with the key in the driver's door lock twice within 5 seconds, and the alarm should not be activated. Wishing you a peaceful night's sleep....