It's for the locking hubs, enabling the switch to four wheel drive.
Nissan Xterra was created in 2000.
Just disconnet any one of the wheels abs sensor connectors
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The 2011 Nissan Xterra has .
The 2010 Nissan Xterra has .
The 2012 Nissan Xterra has .
The 2013 Nissan Xterra has .
The 2014 Nissan Xterra has .
The 2013 Nissan Xterra has 24 valves.
The 2009 Nissan Xterra has 24 valves.