Scan your car with VCDS - it will tell you exactly what has set the alarm off. You may have a faulty switch in one of your doors - had problems previously with VW Passats with tailgate alarm switches in locks.
This alarm unit is used on "GB" model B5's designated in ETKA (illustration 951-40) by "8D-X-200 001 >>", so assume this is from this VIN number up.
The part number is the same, i.e. 8L0 951 605 A. VIN numbers before this and non-GB models would seem to use a "High Tone" horn and no siren...
The standard Audi B6 Siren (2001+) suffers from internal batteries becoming flat / leaking and they are not user replaceable requiring a new siren at a cost of at least £85+. The internal batteries are 2x large button cell type: "N3H 3.6v 160mAh", and are no longer made by the OEM in Germany...
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