I have 2005 Sequoia and the key remote is good and battery good ,but not working

You could get a second opinion, but if diagnostic testing has revealed a problem regarding the component that communicates with the key -- then it seems about right cost wise. I do not know of any way you could fix this yourself; again, you could get a second opinion, but often times dealership programming is required following repairs anyway. https://repairpal.com/repair-shops/toyota-repair-and-service-in-beaver-pennsylvania Might be worth contacting someone locally via phone with your story and inquiring their thoughts.