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Years ago, I bought an emergency key from (or through) my local Porsche dealership. At the time, it was PN #955-538-916-00. I can unlock and start my 987.1 Cayman S with only the emergency key, even if my battery powered keys are nowhere near the car. The key does not contain a battery.

My questions are: "Does the key contain an immobilizer (RFID) pill?" and "How does the car recognize the pill?


The batteries in the key fobs are only for the keyless entry operation (remote).
Those keys that do not have a remote (valet key) therefore don't need batteries.
All Porsche keys (after 1986) contusion the immobilizer pill without which the car will not start.
The immobilizer pill is a passive RFID chip that is activated by proximity to the RFID reader which creates an electromagnetic field that excites the pill which reflects back to the reader a predetermined (preprogramed) sequence.
Happy Porsche'ing,

Pedro Bonilla
1998 Boxster 986 - 304,000+ miles: [www.PedrosGarage.com]
PCA National Club Racing Scrutineer - PCA National HPDE Instructor - PCA Technical Committee (Boxster/Cayman)

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Boxsterra - 2 years ago
It's behind the round door shown here
Re: Yep
j.davis - 2 years ago
you didn't include a pic of the part I was showing. Regardless, the car won't start without a RFID pill present.
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