How can I get my key fob to work again?

Key fob stopped working this morning however the red light was still flashing (red light), changed the battry and now the light red light doesn't come on and the fob still doesn't work. Car details and fob are Vauxhall Corsa 1.0 2002 Key Fob Siemens 5WK4 8669.

Any ideas?
Archer, April 2008


done
My key fob didnt work i changed the battery several times and nothing so i was back to unlocking the doors with the key. however i put the key in the ignition so the dash was lit up and pressed the lock button on the key fob which seem to reprogramme it and now its working fine.

debbie, October 2008
Sorry, I'm an auto service professional and am trying to find out help with the same problem.

Kraker, July 2008
link Click here to see other fixes for Vauxhall.