Hello. On my '13 two of my tire valves are leaking air right where the valves seal on the rim hole. Tire shop tried to fix it by replacing the o-ring and one valve stopped leaking. Then the other started leaking a couple of weeks later. They can be tighten with a 12mm socket and I tried that but made it worse. The o-ring that we used was another one that the tire shop had sitting around and not the OEM. Has anybody had this problem ? Does Ford sell the o-rings without having to replace the entire valve and possibly the sensor too. Thanks.