Spare keys/remote no longer locks/unlocks/starts car - help?

[S4IN333]

Hi everybody,

I have a 2010 S4, all this time, I've always only used ONE of the 3 remote/keys that came with the car. The 2nd master remote/key and the spare key (the one with no buttons) were always kept in a drawer. Today, when I tried to use the 2nd master remote to unlock the car, it didn't work. The little red light on the remote still flashes, but nothing happens to the car. I also tried to start it with the 2nd master remote/key, and it also didn't work. The only thing that works with the 2nd remote is if i lock/unlock the door using the physical key. I assume that the key has un-synced from the car due to lack of use?

I know there is a way to reprogram the keys for the VW/Audi's with the switchblade key with one in the ignition and one in the door, but does anybody know how to do that with the B8 A4/S4 remote fob?

Thanks in advance!

[mkato13]

Do you have Keyless entry and keyless start? It may need to be charged (in the slot where key goes) and then used but just guessing off other cars

[S4IN333]

Nope, don't have the keyless entry/keyless start thing.
The light flashes on the remote when i press it, so the battery should be okay?

Also, I don't have a VAG Com. Was kinda hoping there's a solution where you can reprogram other keys with 1 working key.

[MrFunk]

If you are in warranty, take to dealership - this should be covered.