to check the tie rods you jack up the front of the car. Place your hands at the 9 and 3 o'clock positions on the tire. Push/pull on the tire. If you feel movement than look carefully at the out tie rod while you push or pull and see if it moves. If it does it is bad if it doesn't than the inner toe rod is bad. PYou will not be able to do the inner tie rod without some specialty tools.
The outer tie rods can be replaced by removing the tire, loosen the jam nut that holds the inner tie rod tight to the outer tie rod, removing the cotter pin (if it has one) from the tie rod end, remove the nut that secures the tie rod end to the knuckle, Hit the knuckle with a hammer where the tie rod goes through the knuckle until the tie rod comes loose from the knuckle (do not strike the tie rod end), remove the tie rod end from the knuckle and unscrew from inner tie rod counting the number of turns it takes to remove, install the new one using the same amount of turns.
After putting it back together you'll need to grease the new tie rod ends if equipped with grease zerks and have the car aligned.
The O2 sensor unthreads from the exhaust manifold as you thought. It will require an O2 socket which is a 7/8" socket with an opening down the side for the wiring harness to go through. you should be able to purchase the socket from the parts store that you purchase the O2 sensor at. DO NOT GET A UNIVERSAL FIT OR CHEAP AFTERMARKET BRAND, this will cause more problems and more money than just getting a good quality sensor from a reputable supplier or straight from the dealer.
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