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Q:

The alert for door ajar is staying on constantly on 1995 Volvo 850

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The door alert will constantly ding when all doors are firmly shut.
(1) Answer
You likely have a bad door switch in one of the door lock assemblies. I would start by checking the drivers door switch since it is used 10 times more often than the others.