Immobilizer (theft control unit) replacement question

[thstone]

The DME, transponder (the little "pill" inside the key fob), and immobilizer all have to be programmed as a set. If you replace any single component of the set, then that component has to be re-programmed to work with the other two components.

It is often easier and cheaper to buy a replacement set of all three components and swap them all at one time.

You will also have to swap the key shank from the "old" fob to the "new" fob so the "new" fob will mechanically unlock the steering wheel lock.

I two complete matched sets and swap all three components (as sets) often in my Spec Boxster race car.