Key Fob Battery

[vath2001]

I recently had to get another key for my car (separate issue involving a broken door lock mechanism).
The dealer told me that they cannot check my key FOB without the original paperwork telling them the codes the FOB should be sending to the car.
Now without asking a separate dealer, I don't know if this is true or not. And I don't want another dealer visit unless its worth my time.

Anyone else know? Because basically, I have the same problem... the FOB flashed the little red light and the car doesn't care.

Thanks