1996 CHEVROLET CAVALIER LS SADAN THE ETS SYSTEM IS

Theres a funny thing with ETS and engine lights in the cavalier. first check the gas tank cap. mame sure it is closed down firmly. If it already seems like it is firmly in place - try a different one from a friend or something like that. when there's air inlet from the gas tank, apparantly the car lights the check engine light becaues air inlet from the gas tank messes with its mixture values.