Fuel Cap Check Engine Light

Hello, if the check engine light was not cleared during testing, then yes - it will have to be cleared to be able to have the evaporative emissions test run again. The fuel filler cap may or may not be the cause of failure. It's what's guessed at first -- and especially at Auto Zone where they want to sell you parts. Even though you picked yours up at the dealership. It's a complex system and they've merely given you an easy guess -- so -- have the code cleared and drive to see how it goes. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops