Why does your door ajar alarm keep dinging in your 2001 Mercury Cougar?

The door ajar alarm in your 2001 Mercury Cougar may keep dinging due to a malfunctioning door switch or a misaligned door. If the switch that detects whether the door is closed is stuck or faulty, it may not register the door as closed, triggering the alarm. Additionally, any debris or damage around the door latch could prevent a proper seal, causing the alarm to activate. It's advisable to check the door switches and latches for issues to resolve the problem.