low beams dont work on passenger side

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! If your 2017 Hyundai Sonata's low beam on the passenger side isn't working after replacing the bulb and relay, the issue might indeed be with the wiring or the socket itself. Sometimes, a corroded connection or a faulty socket can cause the light to fail. If by "flap" you’re referring to the headlight assembly or housing, it might not be the usual culprit, but it's worth checking for any signs of damage or moisture inside. The socket can often be replaced separately if that's where the problem lies. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.