Check engine came on. Replaced CC 2014. Do I need to replace CC again?

No, and as of tonight the light came back on. The check engine light was on a few months ago and after putting a fuel injector in my gas tank it went away, but just tonight the check engine light came back on. When I had Autozone run the computer test, they stated nothing was wrong, but to put a fuel injection into my gas tank and normally the light will go off after several times of turning the car off and on.