Mine is a 2004... Known as the Beta testing year, the 2003 being the worst...I didn't know either of these.
I looked up CR and their readers say the 2016 was terrible in terms of reliability.
No rating for 2015 or '17.
What year is yours?
Cayenne years rated by one owner.
My Lotus is an '89... much more reliable. In 46k miles and 18 years03=yuk
08=my best so far
09=sounds better internally
10=sounds better externally
Only left me stranded a few times...
1)Lost 2 fuel injectors (my fault)
2)overheated on track, lost over a gallon of coolant ($2 pressure cap venting at 11psi rather than 15psi)
3)headgasket #2 (coolant system restriction, prob my fault)
1)Stranded first time it got wet, requiring a computer reset with a laptop and rewiring the canbus wiring under the driver's carpet due to 6 bad factory splices with no waterproofing.
2)fuel pump died
3)radiator sprung a leak along with transmission cooler
4)stranded again while hiking, needed a laptop to get running again every time it started until I redid the wiring under the dash for the steering lock.
This is within 3k miles.
But I'm the 6th owner, and where else can you get 450hp and 450lb-ft, the ability to tow 7000lb, carry 5 people, go off road, and still be pretty sporty and luxurious.. all for $10k ;P