I've only had mine for 6 months, but I've had absolutely no problems. All reviews that I've read online and discussion boards indicate that the Pathfinder is an extremely reliable vehicle. 3.5 V6 also has tons of power making the vehicle really great to drive. Check with the dealer, mine came down thousands off the sticker price. This is a fantastic underrated vehicle.
Bought this 2004 Pathy in 2016 as a reliable every day run about that would be capable of hauling almost anything short of large commercial supplies. When purchased, it had only 59k miles on it. It was a bit tired and needed some TLC. Body, paint, and interior in remarkable condition given its age. Replaced the tires, shocks and struts and had a local Nissan dealership give it a good look-over. It is one tough little SUV. The acceleration is quick, rides very comfortably and is small enough to easily park it anywhere. The only downside is the 16 - 21 mpg's. I can live with that. Great vehicle and intend to drive it until it dies, which given its low mileage, will not be any time soon.
I bought a used 2004 Pathfinder LE with 74k miles, all the bells and EXCELLENT SHAPE, really like new condition in 2012. So, 21 months later not one issue, very reliable truck and awesome in the Chicago winters after mounting a set of New Firestone Dest LE2 on all four corners. Don't understand fuel capacity?? Says it has a 21 gal tank and its never taken more than 16 at the pump?? The only thing I would change on this truck would be the 4 speed transmission! Really needs a min of a 5 speed which would much improve the fuel economy. I now have 107k miles, truck is still in excellent shape and running as strong as day one. Solid Solid no non-sense truck.
A lot of problems, SUV has under 100kmiles, service engine light all the time is there, bad catalitic converters and oxigen sensors, overheats uphill when I pull my boat, bad front suspension, bad brakes, piece of crap.