[78F350]

This first post is a little background. The second post is the DIY.

I have two Boxsters and a VW Passat that I purchased used with just one key each. In life, I have left a trail of keys ...in the forest, at the bottom of the lake, and in the sand at the beach. One key is not good.

986s have an immobilizer that consists of:
Transponder – Shaped like a large grain of rice and mounted inside the key fob.
Transponder Coil – Looks like a rubber disk around the ignition switch.
Central Locking Unit – (CLU) a black box under the driver's seat.
DME – (ECU) The engine computer in the rear trunk.

Simple explanation is:
When you start the car, the CLU queries for the transponder. It sends a signal out through the coil which is picked up and re-transmitted by the transponder. The coil returns that signal to the CLU. The CLU sends a signal to the DME where it it verified and allows the car to be started.

Normally the transponder is in the key. I simply took the transponder out of the key and relocated it to a place where it will still function. The range where it can be placed is very small.
Once the transponder is placed in the car rather than the key, you simply have to make a copy of your key blade to have a spare key.


Disclaimers:
I really don't know any of this stuff. For research, I glanced at a few web pages and watched a YouTube video.
If you follow this procedure you will ruin your car. You are likely to either break or lose your transponder, then have to pay a dealer $2,675 to get your car running again.
If you successfully complete this DIY, you are defeating an anti-theft feature of your car. It will be stolen, then abandoned when the thief realizes how much it costs to maintain.
This is probably not legal in California. Neither are most of my guns.
Once your car has been started I think that it will keep running even if the transponder falls down rolls under your floormat. I still would not completely rule out that loss of the transponder signal will cause your car to stall at a railroad crossing and be unable to restart. Have a contingency plan.

Note to my insurance company: This is all theoretical. After taking the pictures, I restored my car to original unmodified condition.:dance: