W205 - Alarm keeps going off

[Marcellus]

For the past week at random times of day the Alarm keeps going off which is getting annoying.

Does anyone have any ideas as to what might be causing it?

I have some sort of memory that this might be a sign that the batter is on its way out.

[Seventy]

I had a similar problem that turned out to be a faulty bonnet sensor.

[Shanghai fan]

Have Sports Suspension. .?
Air Shocks ? Total pain they leak overnight. Car drops Bingo. Alarm wakes the neighbours.
Just replaced a pair of rear shocks on a C63 .

[Marcellus]

Seventy said:

I had a similar problem that turned out to be a faulty bonnet sensor.

How did you isolate thatbas the cause?

(No air suspension)

[Seventy]

Garage did - I guess they have a tool!

[Classy6]

Xentry diagnostics is able to display previous causes of alarm triggers very simply.

[Marcellus]

cheers both, looks like a trip to the garage then