Car beeps all the time "doesn't recognize key" no big deal ordered new key fob from Porsche.
But now while key is nowhere near by and car is parked for awhile the dash message center comes on and beeps like it can't find the key. Went to drive the other day and battery was almost dead and I just replaced it 2 months ago.

I had this issue when one of my rear door lock mechanisms went bad. Actually both rear door locks went bad, one after the other... are you able to lock the vehicle(hear the chirp) with the key fob? I f not, the vehicle eats the battery up while I guess trying to synch the locking system.

Chris

 

There's also the possibility that the actual alarm module (siren+some electronics) is starting to fail. The modules have a built-in rechargeable battery (non-replaceable) with a documented 10 year life (from the battery manufacturer), since your car is 11 years old, that battery has or is getting ready to fail. Unfortunately the only way to stop the behavior is to replace the module. That's expensive (around $400/part) and a used part isn't recommended since it is also subject to the 10 year life, and if you get a used part from the newest 958 built, it's at least 6 years old now.

The module is located in the cowl area, under the windshield wiper mechanism which must be removed to replace the module. The wiper-arms and cowl trim has to be removed, the wiper mechanism has to be disconnected and removed, and then the module can be accessed. The worst part of the job is R&R of the cowl trim, it seems to glue itself in place and is very difficult to remove without risking damage to it. It took my mechanic, who is quite skilled - about 3.5 hours to do the replacement.

The rear lock mechanisms are also known to fail - it seems with use (the more the rear doors are used the more likely they are to fail) and rough usage (one of mine failed after an asshole friend of my wife was pissed about something and slammed the door getting in. That little temper tantrum cost me about $600. He's no longer welcome in my car.)

Welcome to the world of complex German electronics... unfortunately, as these cars age, we'll be seeing more and more of these sorts of oddball electronic failures.

Meanwhile - @FTOP - please visit New Member Introductions and introduce yourself and your Cayenne. Pictures are welcomed!

 

There's also the possibility that the actual alarm module (siren+some electronics) is starting to fail. The modules have a built-in rechargeable battery (non-replaceable) with a documented 10 year life (from the battery manufacturer), since your car is 11 years old, that battery has or is getting ready to fail. Unfortunately the only way to stop the behavior is to replace the module. That's expensive (around $400/part) and a used part isn't recommended since it is also subject to the 10 year life, and if you get a used part from the newest 958 built, it's at least 6 years old now.

The module is located in the cowl area, under the windshield wiper mechanism which must be removed to replace the module. The wiper-arms and cowl trim has to be removed, the wiper mechanism has to be disconnected and removed, and then the module can be accessed. The worst part of the job is R&R of the cowl trim, it seems to glue itself in place and is very difficult to remove without risking damage to it. It took my mechanic, who is quite skilled - about 3.5 hours to do the replacement.

The rear lock mechanisms are also known to fail - it seems with use (the more the rear doors are used the more likely they are to fail) and rough usage (one of mine failed after an asshole friend of my wife was pissed about something and slammed the door getting in. That little temper tantrum cost me about $600. He's no longer welcome in my car.)

Welcome to the world of complex German electronics... unfortunately, as these cars age, we'll be seeing more and more of these sorts of oddball electronic failures.

Meanwhile - @FTOP[ER] - please visit [URL='https://www.cayenneforums.com/forums/new-member-introductions.11/']New Member Introductions[/URL] and introduce yourself and your Cayenne. Pictures are welcomed!
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Thanks for the

 

Thanks for the advice I'll have to see exactly what that entails and figure out we're to get one.