Fixing all your keys
AO Silver Member
Join Date: Mar 2001
Location: United Kingdom
County: Tyne and Wear
Re: Need new 147 key
It is common on one type of circuit board for the capacitors to degrade and introduce - or more accurately, to stop preventing - noise into the transmitted signal. This dramatically degrades the effective distance for the key as the car cannot easily detect the signal though all that noise.
Incidentally, it isn't anything to do with which versions have a LED or not (did you know that most of the key versions with no LED do actually have one fitted but the case doesn't have the viewing hole!), but it is specifically a particular 3-button circuit board design version that has the range problem. From experience it does appear that the range drops off substantially but the key still works if you don't mind having it pressed against the car (or your head). That is ok for a spare, IMO.
Unfortunately the components are so small and fiddly that it is just not worth the effort in finding the faulty one, and it is simpler and cheaper to supply a replacement board of a type which does not have the same problems and have the car coded to accept it.
Just to add more complexity, some 2-button key versions also have a sudden and dramatic range reduction, although this is due to a particular fault which can be repaired.
For WillisTi, you probably have one broken key and one with a poor range. One needs a repair and the other ideally a replacement board.