2008 Cayman alarm going off; when it's not supposed to

[rob.kellock]

Door locks? Fixed the alarm gremlins on my 996 - OPC replaced mine and it wasn't too horrific price wise but would be covered under warranty for you.

 

[Richard_Hamilton]

To disable the interior monitoring sensor, you have to double-lock the car. That's 2 quick turns of the key.

 

[uknick]

My 2008 Cayman alarm is going off for no reason.

It first did this last May when car was 3 1/2 years old. It is a daily driver and does about 20 to 30 miles a day; took it to OPC last year but they could find no errors being flagged. Then, it worked fine until a couple of days ago.

If I unlock the car and then lock it again, after about 2 minutes the alarm goes off again. The only way to stop it is to unlock car, leave it unlocked for about 30 minutes, then lock it again. Doing it this way seems to work fine.

I don't think it is the movement sensors inside failing; if I turn them off by locking the car with the key it still goes off after about 2 minutes.

As the car is now 4 1/2 years and 38k miles I wonder if it is the battery. But, there are no other problems with car; starts first time on the button, no warning lights have come on.

So, before I spend huge amount on new battery (I have extended warranty), anybody got any other suggestions?

 

[uknick]

ORIGINAL: Richard Hamilton To disable the interior monitoring sensor, you have to double-lock the car. That's 2 quick turns of the key.

Thanks Richard I'll try that next time, and also RTFM correctly.