How do you change the automatic transmission fluid for a 2002 Toyota Celica?

Unbolt the drain plug bolt on the side of the tranny to drain.

Put bolt back in.

Undo filler bolt higher up on tranny and using plastic filler tube attached to tranny fluid bottle (Dextron III) push tube into hole and keep bottle above hole, then turn valve on tube connector to "on" to let fluid flow. You may need to squeeze bottle.

You will probably have to remove some engine covers on the newer models. I typically pass the bottle up between the radiator and the engine to get a good flow. Luckily, you can't overfill easily, because when it's full, it will run out! You just have to quickly plug the hole up when you pull the tube with the bolt.

Get the filler tube w/connector at Autozone or similar store. Autozone is good for batteries, hoses and fluids. Better elsewhere for parts as they sell rebuilt, not "re-manufactured" parts rebuilt by in Mexico -who just slap parts together without regards to tolerances or specs. You get what you pay for brother.

Always get re-man vs. rebuilt!

Aunt