Engine Light Comes on on 1996 Lincoln Town Car

Engine light comes on and book says it may be gas cap, so we take it off and re-install it and in about 3 to 4 days light goes off. Should we replace the gas cap? it has happened twice.

Asked by for the 1996 Lincoln Town Car
2 answers
How often does the light come on? Are you finding the gas cap loose or not installed correctly when the light is on?
yes i would replace fuel cap