Omega keyfob for central locking.

HI all.

I just tried to lock my car on the keyfob, and it doesn't seem to want to work. I went and got my spare one, and that won't work either.

I don't think it's the battery, as the light on the keyfob (when you press it) come on.

Can anyone help please........

sir,
i have second hand opel omega, the battery gets dead because of not using it. after i replace the battery, the check engine blinks. i look to the owner's manual and i found out that if the check engine blinks, there is aproblem in immobiliser. i went to the shop and i ask them to diagnose my car with their scanner. they found out that it has a problem with the key immoiliser. they check the key and they found out that the has no trasponder inside. how can i start my car without this transponder? please help. thank you very much.