Left oil cap off and check engine light came on

Hello, it's not certain that your check engine light came on related to your oil cap being off. However, if it was caused by that, you'll still need to clear the diagnostic trouble codes to have the vehicle perform self testing again for the related systems. I'd recommend having diagnostic trouble codes (DTC's) retrieved and evaluated, then cleared if inconclusive. Then drive further and see if the light returns. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops