2007 Passat with an electronic key. The battery dies, I changed it and without the back cover on the key worked, but with the back cover on it won't work. The car still starts but it wont lock or unlock the car. Also my emergency key wont turn the emergency lock on the drivers door. The key goes in but it just won't turn to open it. I'm wondering if anyone has had this issue before and what the outcome was. Thank you!