Hi, I did the same as you bought a key fob off ebay, then found this site http:/www.audittcca.com/faq/1045086641 that gives details on how to program the fob yourself,I tried it but it didnt work on my key, apparently there is a number on the key where the battery goes and it says which car the key fob is suitable for (I did not know this when buying the fob) I spent £40 at the dealers trying to get the key reprogrammed but it was no use, so the cost of a new mainkey and transmitter was £129.44 inc. VAT Hope yours works :thumbsup: