I recently purchased a 2001 325i(or Xi) and the remote key worked 2wice maybe but was very delayed, now it doesnt respond whatsoever. I have also tried to resync the key without success.
I read here:Diamond Key Battery Replacement - E46Fanatics
He stated replacing the battery TYPE (Panasonic VL-2020 Lithium Coin Cell battery)
from any shop that sells specific batteries will fix the problem.
The problem is that i only have ONE key with this car, one master.
Can i still perform the procedure above mentioned in link with success??