Hi, I need some assistance with syncing my B7 fob. I used the car with my usual fob but when I got home the car wouldn't lock. Changed the battery and now I am unable to resync the fob with the car. Followed the procedures in the manual as well as searching online but no luck. The key unlocks and starts the car fine. Red light is flashing ok on the fob. No issues with spare key/fob. Please help. Thanks.