On [XXX] I took my automobile, a 2021 Kia K5 to Planet KIA of Charlotte NC located at 4700 E independence Blvd. I took it there to check what caused my engine light to activate. The initial diagnosis was a bad Sensor-Differential Pressure. Planet KIA repaired the Sensor-Differential Pressure at the cost of $501.17. My extended warranty company Route 66 covered $350.28 while I covered the remaining balance of $150.89. The engine light came on again the next day and while driving back to the dealership, I experienced the car slowing down and difficult to gain speed in highway traffic. I returned the automobile to Planet Kia of Charlotte and on [XXX}, I was informed that I had a valve failure which in turn caused my gas tank to swell. On [XXX] the warranty company denied request to pay for repairs due to their policy of not covering emissions which pertained to the valve. Kia refused to fix this problem due to a service campaign recall had been performed on the vehicle before I bought it. They found no issues with the vehicle pertaining to the valve or gas tank swelling. This is clearly a manufacturers defect, and it should have been repaired by the manufacturer. If you can, please help. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)