Table 1 shows one common forward collision avoidance related problems of the 2011 Porsche Cayenne.
| Problem Category | Number of Problems |
|---|---|
| Adaptive Cruise Control problems |
At highway speeds, randomly a serious unsafe to operate 'service necessary' warning appears on the instrument panel and the cruise control malfunctions; abruptly shutting off. With the service necessary warning indicated, the vehicle is unsafe to operate. This unsafe vehicle is not drive-able with cruise control. Error will go away on its own. This breakdown appears to be known to Porsche based on what I have seen on internet community sites.