Q: Do i need a need a new gas cap/do i need an allignment?

Hello!

Your question related to the gas cap suggests that you may have the incorrect gas cap installed on your car (if the original problem was in fact the gas cap). Unlike most vehicles in earlier years, these are generally vehicle specific in later model-year cars. The fuel cap is a critical component in a very complex evaporative emissions system. Fuel systems produce fumes, as vapor. When we drive our cars, the vapors collect in the fuel tank. If we do not remove and destroy these fumes, they could enter the passenger compartment or the atmosphere. To prevent this, an evaporative emissions system contains, removes and disposes of the vapors. When the fuel cap is not on tight or sealed correctly, the evaporative emissions system detects this and will cause the check engine light to come on. A YourMechanic certified technician can come to your location to perform a gas cap replacement on your vehicle and confirm if there are any other issues related to this symptom.

As to your question related to hitting the median, this may very well have caused either damage to suspension components or potentially caused the alignment to become compromised. When this happens, your car will often times wander a bit or pull noticeably to one side or the other as you describe. A YourMechanic certified technician can come to your location to perform a Car pulls in one direction Inspection on your vehicle to help you diagnose this issue and suggest any required repairs.