 I bought my 01 Pathfinder in 04 with 39,000 miles on it.  I now have almost 113,000 miles.  First let me say that I love the engine.  It rev's quick and has the power of a small v8.  Overall it is holding up well but I've had some issues.  They are: 1 - 2 mass air flow sensors have crapped (when this goes the vehicle goes into safe mode and rev past 2000 rmp) 2 - 1 O2 sensor 3 - the drivers power seat has stopped going back and forth (i'm living with it as it stuck in my position) 4 - the stock Clarion 6 disk changer stinks.  I replaced it with aftermarket single disk unit. (I will never buy Clarion) 5 - Rear defroster only defrosts half the window. 6 - tranny leak that went away. 