Sueps

Hello, Thanks for the replies. I tried the reinitialising but couldn't get it to work. I can't find anything in my manual about changing the battery and reinitialising the key. Then I remembered that I'd had a second, rather tatty, key with the car so swapped the insides of them. Now, for some strange reason, both of them work! Anyway, thanks again. Have seen a couple of threads on here about "limp mode" which my husband's c5 does, so will have a look at them!

Hi all, Sorry if this topic has been covered before, I tried to use the search box but for some reason the words "key" and "fob" are forbidden (!?). I just needed yesterday to replace the battery in my key fob but now I have the darn thing won't work. I'm fairly certain I've replaced it before with no problems as I've been carrying a spare battery around in case it happened again, and I would only have found out which type of battery it was by replacing it once. Hope that makes sense! Weve checked the battery with a multi-meter and it's reading about 3.25v. I saw something somewhere about pressing the lock button with the key in the ignition, turning the ignition till the dash lights come on and holding the button for several seconds. I held it for about 30 seconds but it didn't work. Does anyone have any ideas please? My c5 is a 2002 if that helps. Thanks, Sue.