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Old 11-27-2017, 11:13 AM   #6
particlewave
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Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,163
Garage
These keys have three basic parts:
1) The keyless entry transmitter which sends a radio signal to the stock immobilizer in order to lock/unlock the doors or pop the trunk(s) remotely
2) The physical key which turns the lock cylinders in the doors and ignition (car will unlock without part #3, but will not start)
3) The transponder coil in the key head (looks like a large grain of rice) which tells the car that it is ok to start when the key is turned in the ignition

A new key from Porsche will need to come with a code for programming it to the car and the cost of the head, blade cutting and programming can easily push the $500 mark.
If you have a key(s) that will start the car, but not unlock remotely, then the transmitter is broken (part #1). As stated above, those that wish to have the remote functions will have to pay a hefty price for a replacement key head, so a 3rd party keyless entry system is a viable alternative (has nothing to do with parts 2 or 3, or starting the car).

If you leave your one good key in the car, you'd be in a real pickle if the aftermarket keyless entry failed.

Last edited by particlewave; 11-27-2017 at 11:19 AM.
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