One problem related to engine exhaust system has been reported for the 2013 Porsche Cayenne. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Porsche Cayenne based on all problems reported for the 2013 Cayenne.
The Porsche Cayenne diesel is designed to not restart when the adblue exhaust chemical is too low. This seems reasonable. However, the vehicle is also designed to not restart when the adblue reaches a low point, even when it is refilled to full capacity. According to Porsche the vehicle must be brought to an certified Porsche dealership for this to be reset, so the car can be driven. Again, this occurs even when the adblue if refilled to full capacity. This seems to be a potentially dangerous and/or expensive situation should the adblue reach this low point and the vehicle is a significant distance from a certified Porsche dealership.