UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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The old black key fobs are easliy programmable as all they control is the central locking
Unfortunately with the new models that have the blue key, these would need programming disingenuous diagnostic equipment. Unfortunatly the keys are not interchangeable.
If the issue with your old fob is just that the battery has gone dead. You are able to get a new battery and case on eBay, these do require breaking the old case to get them apart and then carrying out soldering to detach and re attach the batteries. Your local garage should be able to do this for you but a dealer will not.
If you require any further information please do not hesitate to ask. Regards. Jake