Key code/frequency

Hello. A friend's Zafira DTi's central locking stopped working from the remote/fob. Never found out the reason. Thinking it could be the remote/fob I have bought another fob off Ebay without checking the frequency, which I realised I should have done afterwards.
On looking at the original remote I cannot find the frequency anywhere on the outer casing because it's probably rubbed off nor on the circuit board inside. Would anyone know how I can find out the frequency??

Has anyone ever changed keys and did they need reprogramming etc? Thanks

supersterl wrote:

yes they need reprogramming

Thanks supersterl.

Getting it programmed is not a problem, but does the frequency matter - does it have to be the same?

Also if frequency matters then where can I find that on the fob. I've looked but can't find it anywhere, not even on the circuit board.

Thanks.

i think it just needs reprogramming bud and frequncy dont matter or they have it vx