Like "Nadeem",my 2009 Cayenne S needs 4-6 starting attempts. 3rd owner. Previous owners drove car and nothing else - it's now getting TLC. Even with new battery from Advance Auto*, 4-6 attempts and it kicks over . . slowly! I unplugged an after-market backup camera before the new battery acquisition. Voltage at 2,000 rpms shows 14.5-15. What the heck??
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Porsche Cayenne Jump Starting and Charging | 2003-2008 | Pelican Parts DIY Maintenance Article