Will this key fob work on a 2003 Pathfinder? Sure looks like it will.   https://smile.amazon.com/USARemote-n-u15-3btn-Frontier-Pathfinder-KBRASTU15/dp/B06XR3FSZZ/ref=sr_1_1_sspa?ie=UTF8&qid=1523629702&sr=8-1-spons&keywords=2003+pathfinder+key+fob&psc=1     And while we're on the subject, will these keys work? What is involved in programming the keys??   https://smile.amazon.com/Discount-Keyless-Replacement-KBRASTU15-CWTWB1U733/dp/B01BKS2LIE/ref=sr_1_23?ie=UTF8&qid=15