Hello, all. Just purchased and programmed a third transponder key for my 2011 Ford Focus using the procedure in the owner's manual. In reality it isn't the key that gets programmed (it's read only) but rather the car's computer/ECM that is instructed to accept the key's unique code/serial no.
Does anyone know of a procedure (e.g. cycling the ignition switch) that can be easily performed by the owner to de-validate/de-program a lost or stolen key from the memory of the car's ECM? My Focus owner's manual doesn't cover this. Thanks for your time and comment. Sincerely,