[cowboyt]

Agreed. That sort of thing is exactly what the immobilizer is programmed to thwart. That's why you need all four pieces, i. e. the keys, the EIS, the ECU, and the shifter, all from the same car.

 

[cowboyt]

I'm afraid that programming EIS's is beyond the abilities of Xentry. You are basically in a "chicken and egg" situation. What's got to happen is that the EIS that you have needs to be "re-virginized". I understand that there are people out there who can do this service for you. Once that's done, then you install your EIS and you should be OK. The other, and even better, way to do this is to have your original EIS "cloned" to a known functional EIS, such as the one you tried to put into your car recently. What that will do is keep not only the VIN information, but also the key hash information, i. e. your existing keys will continue to work.

So, who does this? Google will be your friend there.

 

[cowboyt]

That cloning...was it done using the information from your original EIS?

 

[cowboyt]

Then they must've done something wrong. I would get in contact with them and let them know what's going on. It's supposed to work if it was cloned properly.

Before doing that, though, I also would double-check Fuse 78, which is the fuse that goes to the EIS.

 

[cowboyt]

That is true. OP, please fill out your user profile with at least the following information.

1.) Specific model, and model year, of your car
2.) Whether or not it's a 4matic
3.) Your general location (country is fine)

We ask for that because as Wally points out, there is variation by year. There is also variation by model, and by country, and we do have an international membership. It's also considered, "good manners" around here to do this.

 

[cowboyt]

Good info, there. Also, please update your user profile with this info as well. It's the icon at the top right of the Web page that represents your account.

Yes, it really does help us to help you out.

 

[cowboyt]

That's why having SDS is so valuable. I can do a diagnostic myself in a few minutes and save a boatload of money.