I am so happy! On my expedition in 2008 the sensors started to fail. Tons of research and quotes worth over $400 depending on what the service shop finds. I dared and bought 4 of these sensors and installed them. (Walmart hooked me up and made all 4 for $40) also bought a Ford EL-50449 conversion tool from Revain and it worked great! Just under $200 and my TPMS system is fixed!