How do you fix Mazda 626 1997 V6 pulley?

To fix a pulley on a 1997 Mazda 626 V6, first ensure safety by disconnecting the battery. Inspect the pulley for wear or damage; if it’s defective, remove the serpentine belt and unbolt the pulley. Replace it with a new one, ensuring it is properly aligned and secured. Finally, reattach the serpentine belt and reconnect the battery before testing the engine.