(Tester is correct) The parts that need to be replaced are the ABS sensors. There is one on each hub… You might want to shop around tho. Those parts and laber are kinda spendy .There would not be any codes for the ABS system on that old of a Cavalier. My 98 Cavalier only through emission codes. In a last ditch effort… if the light comes on…The cars manual will recommend that you find a safe place to pull the car over. Turn the car off and count 30 sec. then turn the car back on… That has also worked for me in the past.
Good luck,
Lycan