My fob died today, so after a bit of research, I have bought a spare battery from Flea bay in readiness to do a bit of soldering etc etc.
However, when I have prised the key apart there doesn't seem to be a transponder in it like those I have seen on Google/you tube etc.
I seem to have, the blade, both sides of the shell, a piece of black plastic that goes over the middle button and the unlock button and the circuit board with battery attached. Deffo no separate transponder!
So my question is, do the early keys (my 330D is a 2001) have a built in transponder?