2008 4.8, key fob dead
 

as the title states, my key fob is completely dead. i have comfort access and have taken the key apart with a razor blade to check the internals and noticed nothing strange. the slot inside the car will detect the fob and I can start it without the key in the slot, but nothing else works.. I was told by an individual that it's a faulty antenna somewhere in the liftgate. anyone experience this?

does your second key work normally? or both keys have the same issue??

Only have one key..

Maybe the battery is dead?

See if this might help you, and I'd get a second FOB just in case..

https://www.youtube.com/watch?annota...&v=J2mM7woeTWQ
https://www.youtube.com/watch?annota...&v=J2mM7woeTWQ

Have tried several batteries

CA antenna is not in the lift gate .. it is located under the bumper ... easily accessed. See if it became unplugged, or if the wiring or something got damaged.

Each door handle has a built-in antenna too.You need a proper diagnostic equipment to make a proper diagnosis of the problem.

Please do not keep starting new threads when people dont reply...

http://www.xoutpost.com/bmw-sav-foru...lems-w-ca.html

you need another FOB.

This issue is NOT an easy 'check the fuse or wiggle the antenna' fix.

Why would you own a car and only have one key?!?!?

100% agree. it is not simple. read this, then take it to a qualified shop:

http://www.bmwmotorsports.org/pdf/e7...t%20Access.pdf

One of my fobs was submerged in water. Are you suggesting that I get rid of my car becuase I only have one key fob for it?