One problem related to catalytic convertor has been reported for the 2013 Infiniti QX56. The most recently reported issues are listed below.
The service engine light came on, and I brought the vehicle to thousand oaks Infiniti where I regularly have the vehicle serviced. The diagnosis was a bank 2 catalytic convertor failure. Based on my research, this is a very common problem with the car and it is just a matter of time that the other catalytic convertor will also need to be replaced.