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We've gone through a battery every two years on our Cayenne. Porsche told me it's because the car largely sits unused. But when it's starting to go weird things start happening with the security module, and the dashboard display. It starts with the security module setting itself to "honk" when armed when I normally have it turned off.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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