My check engine light start coming on in 2011. I have a toyola Corolla 2009.

what code does it come out with and have bought a new gas to see if its the problem.

you need a new shop. you have an evap issue and it is difficult to diag but can be done by a competent shop. Roy

It's awful if the dealer can't fix an evap problem, canisters fail a bit but as Roy said any competent shop can do it by using a "smoke machine" to check for leaks.