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So my car keys were stolen and I have found a few used TWICE modules with their matched keys (and locks and ignition switch) on eBay. My questions:

1) Do I need to match any of the numbers of my TWICE to that of the donor car?

2) If I am installing a used TWICE into my car (that already has a programmed key) do I need to do any programming with my car/ tech II?

3) Is this a DIY fix or do I need anything special from a "dealer" or foreign car shop?

I've been seeing a lot of instructions for removal but none for replacement. Any information you can provide would be helpful. I have a 1999 Saab 9-3.
 

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On your '99 9-3, the TWICE is plug and play, no programming involved.

The keys it knows about will satisfy it's security needs, so as long as you can get keys to match the lock you're good to go.

Basic equation: TWICE + matching key transponder + key for the lock = goodness!

On the 2000's and later (or all the 9-5's) there's an immobilizer code that must be programmed into the TWICE with a Tech 2 but your 99 won't need that.
 
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