Key remote does not work
I usually rotate the 2 keys every few months. They never have any problems even after serveral month of inactivity so I can assume their batteries can last at least that long. This time, after 3 days of not using the car, my current key's remote no longer works (it can still physically unlock and start the car). I have been driving with the non-working key for serveral days hoping to get it recharged, but it still not working. My other key works well.
Do I have a sudden dead battery or the key just lost sync? I know the procedure to reprogram the key, however it requires to do it in the order of key1, key2, etc. I don't know which key is key1. If my non-working key is key1 and it indeed has a dead battery, would it render my working key not working? I just don't want to risk the working key.
Appreciate your suggestions.