my alarm is malfunctioning, often going off on its own- on 1999 Porsche 911

car has 145000 miles. recently alarm malfunctioning and emitting lite on dash not appearing at all.

Asked by for the 1999 Porsche 911
1 answer
It could do this for many reason which requires an OE diagnostic computer, but I'd start by checking the battery with a good battery tester.
This would be the first and cheapest test.