If you re-add your remaining key then the stolen key will be blocked. You'll need the 5 digit electronic code.

A locksmith should be able to create a new key based on your existing key and then add both keys.

 

I don't understand "re-add". Is this changing the 5 digit code? Can I do this with multiecuscan?

 

yes, 1 new key is enough, you can reuse the one you have left.

 

Check BCM 'Key Programming option' under adjustments in MES. You're simply adding keys to the BCM and they become the valid key(s). You need the 5 digit code. Locksmiths that are able to create/add new keys are able to somehow figure out this 5 digit code and the encryption password presumably from the BCM.

 

I don't think they are, they just make a copy of the existing key so for the car it seems like the same key always.

 

There is a continual confusion over new keys and terminology, cloning a key means the two resulting physical keys are indistinguishable by the BCM, transponder id has been cloned, this is not going to work for keys that use a rolling code as the keys will become out of sync i.e. a rolling code cannot be used twice. It's a good solution where your existing key or remote is faulty. You could try to manually keep the two keys in sync by continually pressing the button on the key which is behind in the sequence.

Creating a new pre-programmed second key copies data from the BCM and existing key and is then programmed into the BCM. The 5 digit code and passwords are sniffed by the key software if not known.

Cloning a key which uses a fixed immobilizer code would work just fine using both keys.

There two types of blank keys, clonable and fixed (for pre-programming)

 

thanks everyone. This is helpful. It seems less scary than I thought. i will get a locksmith to make a new key and then add them both. I guess I need a locksmith to make one and probably program the transponder. Then I can add them. The thief will still be able to get into the car mechanically but at least cant drive it away, or open the hatch. I would have to rebarrel everything otherwise and that for sure will be expensive. This seems like 150 euros or so for a new key and I am done. (did realize I don't have the 5 digit code though.. thought I did but that was my 147)

 

The hatch lock has a release button on the inside. At least the alarm will go off.

Changing the door and ignition barrel might be worth it. You can swap the PCB/immobilizer from your key into the one which comes with the barrels and then get a copy done.