The EGR valve can become clogged with carbon, which causes the Check Engine Light to illuminate. This can result in moderate to severe misfires on acceleration and the EGR valve and passages will need to be cleaned.
Problems for specific Nissan Xterra years:
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Newest reported 2000 Nissan Xterra problems
The coolant outlet on the front of the lower intake manifold may develop a coolant leak.