One problem related to carrier/rack has been reported for the 2004 Nissan Armada. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Nissan Armada based on all problems reported for the 2004 Armada.
The exhaust manifold is cracked on the diver side ,I found that on 2004 and newer models Nissan Armada all where cracked. When starting you can here the exhaust leak.