I think the EWS system is passive (no battery required in a valet key) so even if the battery failed in the master key the car will still start. The EWS system read off the keys rf id chip I would try getting a valet key (grey one no remote) from a dealer, should cost about £20 I think hope this is ...

hello mate

I have what I think is a dynavin and I hate it! I would gladly swop it for your standard satnav/cd changer
install.

all I want is radio2 and me tapes/cds not dvds ipod this and usb that!
what colour plugs should I have in the boot to fit it!

hi, just joined this forum after lurking for a day

ive just got me a lovely e53 3.0i sport auto, and liking it very much so far.

im bound to have questions soon  :-[