2002 Nissan Frontier timing belt

Timing belts are found on the 3.3L engines, timing chains are on the 2.4L engines. The 2002 3.3L Timing belt is changed at 105K during the major service. This service can run over one thousand dollars. It is recommended to replace the belt, tensioner and idlers, cam and crank seals, water pump, and both belts when changing the timing belt. That way, you only open up the front of the engine every 105K. Why change the timing belt and have a water pump start leaking only 20K later and ruin the belt with antifreeze? Other items during the 105K are a major tune up with all the fluids changed and a lube. This does get expensive. You can break it up into several blocks of time and spread the related service items out over a few months to take some of the sting off.

The frontier engines use timing chains.

On every car you should replace the timing belt every 60k to avoid
engine damage . so if you want to keep that car you know what to do.