CV stands for "constant velocity"; its the joint on the front axle that distributes power to the front wheels.
Pretty much I think they sell the joint + axle as an integrated unit. I don't know the specific price for a Celica, but for most cars they're $200-$300. Labor to install is probably going to be around another $100; a Toyota dealer will charge more. Most good shops will do that for you; you don't have to take it to a Toyota dealer, although it might be better if a dealer does it if the car is under warranty.
300,000 KM/Sec. Its not just a good idea, its the law.
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