Transponder key replacement

https://echo-wiki.win/index.php/Transponder_key_replacement

Losing your car's key fob is frustrating, but replacing a transponder key is straightforward. I had to get a new one for my older Subaru; the locksmith matched the chip's frequency to my vehicle's system, then cut a backup metal key to manually unlock the door in case the battery dies. The process took about 15 minutes.