Xhorse VVDI Key Tool Plus FEM/BDC Error ‘Need Preprocess’?

Question: I failed to make key BMW FEM with xhorse vvdi key tool plus. It requests to preprocess. What should I do?
Vvdi Key Tool Plus Fem Need Preprocess


To program BMW FEM key (add key or all keys lost) with key tool plus, 3 steps should be carried out.

Step 1: Read key info.

Step 2: Program FEM/BDC system

Step 3: Prepare dealer key

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  1. Read key information

Get all the key ID and status (whether to enable) in the car immo system.

Read the car immo system status, version number and key ID and key status, etc.

If there is an abnormal situation for the vehicle, please continue after correction.

  1. Programming FEM/BDC system

This function will automatically back up FEM/BDC system code, the backup code will fail during the preprocessing process, you need to back up manually (it is OK to back up successfully once during the entire vehicle operation process).

Please check if the original key is normal first after preprocess

In this step, it will do preprocessing.

Programming preprocessing

  • This process need to be operated on bench and make sure step 1 and step 2 has been completed.
  • Charing FEM/BDC system and connect OBD

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  1. Prepare dealer key 

This function will use the car ignition switch to generate dealer key.

Ensure that the frequency is consistent before learning keys, if the learning always fails, replace other keys to try.

Related guide:

Xhorse Key Tool Plus Program BMW 320D 2013 FEM/BDC All Key Lost

Xhorse VVDI Key Tool Plus Adds BMW M4 2017 FEM Key Success