 This is my 2nd Pathfinder. The 1st, a 1998, was great.  The only problems until now was excessive rattles.  Same with 1st one. However, I just got a "sevice engine soon" light so I got it checked. The dealer says my catalytic converters are shot and new ones will cost almost 2000.00!  It seems to me 4.5 year old and 70k miles with all scheduled service and no unusual driving the car should not have this problem.