I need another (third) spare 406 key, which I shall buy on eBay, and have spent hours reading previous postings on this group about keys but still I don't understand how to buy the correct one. Although it would be useful to have another remote key I would be happy to settle for one that is not a remote, it is only for back-up use. Does that make it easier to buy correctly?
I have just bought a blank blade and that appears to be OK but the fob that I purchased from someone else turns out to be the wrong kind. Like my present key, it's the correct shape and has two similar buttons and no led, but the blade is only 2mm thick when it should be 3mm. (I didn't know they varied!)
Even the two key fobs supplied by the dealer for my 2001 reg 406 are quite different shapes. One is fairly square in shape the other has a sloping top but perhaps that is because only one is a remote.
These are some of the points I don't understand the relevance of, when deciding what to buy:
Some blades are retained by a small screw, some are not. Does that matter?
I believe that infra-red has a led whilst radio frequency ones do not. Is that correct in every case?
The 'spare' key supplied by my car dealer has no buttons and doesn't appear to have access to a battery. Does this mean it doesn't have a transponder?
Are there any other hazards that I need to be aware of?
I realised this was going to be a minefield but I seem to be getting more confused the further I get into it!
Can anyone please help?