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2002 996 Cab Alarm Goes Off In The Sun?

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Trying to buy an 02 996 Cab.  Did the PPI today and ran across a strange issue.  I've discussed it with the PPI mechanic and my mechanic and neither are certain about this issue.  When the car is parked in the sun with the doors locked the alarm horn begins to sound after about an hour or so (when it warms up).  PPI mechanic says he has seen it on two other cars, all 996 Cabs.  Local mechanic says he has seen something similar with the "horn frame."  PPI mechanic says this is NOT "horn frame," it definitely has something to do with the immobilizer, and the car is NOT throwing any OBD codes.  Car checks out great other than this issue.  Just a few wear/tear items like brakes, rotors, and coil pack that I'm okay with.


Any ideas?

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  • 2 months later...
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Many times the 2 beep alarm fault is because the center console arm rest storage door is not fully latched, or the rear side windows are not closed.  Because the interior security motion sensors are IR based, sometimes when the car's interior gets hot, the movement of the stratified air in the cabin will set off the alarm.


Also make sure the hood and boot are fully closed and latched.

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