Just bought a 2003 Amazon and got a broken black 2 button key and a grey key. Reading up says the grey key is a valet and it does put the security light out a couple of moments after I put it in. The black key had no red light on button pushing so I changed the battery. It starts the car but the buttons won't lock and unlock the car. Has it lost sync with the car perhaps? I have read many threads but nothing seems to cover this. Am I best off going to Toyota for a new master key? Thanks!