One problem related to body has been reported for the 2001 Nissan Xterra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Nissan Xterra based on all problems reported for the 2001 Xterra.
Right rear floor pan began creaking in may 2002. Upon closer inspection, the right rear floorpan was found to have a crack at least an inch in length. The sheet metal is cracked completely through such that you can see light through it. I took the vehicle to Nissan west in ellicott city maryland at about 38000 miles. They told me I was out of luck since the vehicle was then out of the 3/36 warranty. Since then the purchasing dealer has documented the crack and Nissan has been notified. I am awaiting a response from Nissan. This problem sounds like it could be the same or related to NHTSA item number 621967.