keyless entry doesn't work
 

my 99 Boxster came with only one key. The remote entry does not unlock the doors or the trunk. I've changed the battery in the remote and still no help.

I searched and found a few threads about how to sync the key to the car (unlock driver side door with key and then press button 1 with key still in the lock) but still the remote does not sync with the car.

anyone have other suggestions?

there's another thread on here with a guy who can fix the key fob for you. Mine only works for the lock/unlock, not the trunk or alarm buttons. The problem is the electronics on the key fobs goes bad and needs either fixing or replacing. he will do some micro-soldering and fix it. do a search for key fob or something. I still need to get with him about fixing mine.
good luck.

Same issue one key worked one key the fob buttons didn’t. Took it to the dealer, fixed.