How to choose the best BMW FEM/BDC key programmer?

Lonsdor K518ISECGDI Prog BMWXhorse VVDI2Yanhua BMW FEM/BDC key programmer all are verified to program FEM/BDC key without issues. But which tool is best for BMW FEM BDC key programming?

Look here and you’ll know all:


1. How to use Lonsdor K518ISEto program BMW FEM BDC key?

Three steps: read key info–>pre-process FEM/BDC system–>make a dealer key

In details…

Step 1: read key info

MUST read key information first

Step 2: pre-process FEM/BDC system


1: OBD back up original coding data:

On the car or test platform, connect to FEM/BDC system, then back up original back up coding files

2: read out EEPROM backup data & generate a service-mode EEPROM:

-> Disassemble FEM/BDC module, find out chip 95128 or 95256, read EEPROM data using a ECU programming tool: VVDI-Prog, Orange5 and the like;

->Copy the EEPROM data into to the Lonsdor K518ISE customfile folder;

->Run the program, read original EEPROM data and generate a service-mode EEPROM, upload data of the service-mode EEPROM, write it into chip 95128 or 95256 with help of a ECU programmer

->Restore FEM/BDC system, supply battery to the car and connect

3: programming

->This step need to be done on the BMW FEM/BDC test platform;

->Make sure that Step 1 & 2 is finished

->Connect FEM/BDC system to power supply and connect

4: restore EEPROM data

-> disassemble FEM/BDC module, write original EEPROM data (Step 2) into chip 95128/95256

-> restore FEM/BDC system, connect to OBD


5: restore coding data

-> load the backup coding files (Step 1), restore coding information

6: pre-processing is complete.

Step 3: make a dealer key

1: Lonsdor K518ISE read out data, select the will-be key position

2: a “used”key to make a dealer key

All keys lost: enter 32bit ISN codes to make a dealer key

3: put the key near the car immo induction loop


4: detect the original key, read out immo data

5: put a new key near the car immo induction loop

6: detect the key key, key learn (don’t move the key, keep stable)

7: key learn is complete

Step 4: disable the key

1: Lonsdor K518ISE read out data, select the key ID position to disable

2: put a “used” key near the car induction loop

3: K518ISE system tries to connect to CAS, disable the key with current ID position, disable key successfully

Step 5: enable the key

1: Lonsdor K518ISE read out data, select the key ID position to enable

2: put a “used” key near the car induction loop

3: K518ISE system tries to connect to CAS, enable the key with current ID position, enable key successfully

Step 6: delete the key

1: K518ISE read out data, select the key ID position to delete

2: read FEM/BDC key password

3: delete the key successfully; the key position is blank


1: You must read key info before everything you’ll do

2: to pre-process FEM/BDC, you should pay attention to:

– backup coding codes to continue

– disconnect to the power supply/battery, have a ECU programmer to read EEPROM data, up load data in K518 customfile folder, read new EEPROM data loaded just now, generate service-mode EEPROM data, read service-mode EEPROM data, write data into the chip, install CPU on the car

– ECU programming: need 6 min, with power supply connected

– disconnect to the power supply, disassemble CPU, write the original EEPROM data into the chip, install CPU on the car, connect to the power supply, make sure communicate is successful

– upload coding files (Step 1), restore original coding info to pre-process, then make a dealer key

3: 32bit ISN codes is required to program a new key when ALL KEYS ARE LOST

Job’s done with Lonsdor K518ISE!


2. How to use CGDI Prog BMWto  program FEM key

Go to BMW Key Match

CGDI-BMW-FEM-program (1)

The current FEM/BDC needs to update the ECU program before performing key matching. Please ensure that the car battery has enough power, the programming process, please keep the equipment cable connection

CGDI-BMW-FEM-program (2)

Please remove the FEM/BDC and then use the CGDI Prog programmer to read and save data from the P5XXX EEPROM chip on the FEM/BDC computer board, then click on Next

CGDI-BMW-FEM-program (3)

Read the original car EEPROM data file

CGDI-BMW-FEM-program (4) CGDI-BMW-FEM-program (5) CGDI-BMW-FEM-program (6)

Use the CGDI Prog BMW to write the calculated new data to the 95XXX EEPROM chip, then put the FEM/BDC back into the car, thn click on Next

CGDI-BMW-FEM-program (7)

Car battery voltage: 11.93V

Prepare the programming ECU

Security authentication is in process

Safety certification through

The ECU is being programmed

CGDI-BMW-FEM-program (8)

Please remove the FEM/BDC and then use the CGDI Prog programmer to read and save data from the P5XXX EEPROM chip on the FEM/BDC computer board, then click on Next

CGDI-BMW-FEM-program (9)

Setting code

Coding is successful

CGDI-BMW-FEM-program (10) CGDI-BMW-FEM-program (11)

FEM/BDC key matching need to enter engine ISN, please select the way of input ISN code

CGDI-BMW-FEM-program (12)


KWP-CAN 500kbps connection is successful

CGDI-BMW-FEM-program (13)

Loading the code data file

CGDI-BMW-FEM-program (14) CGDI-BMW-FEM-program (15) CGDI-BMW-FEM-program (16)

Coding is successful


3. Xhorse VVDI2 do coding/programming to BMW FEM BDC

MW FEM/BDC Coding/Programming with VVDI2 full kit 4.3.0


step 1:

  1. read FEM/BDC coding on the bench
  2. you’d better not close this window after starting this procedure

step 2:

  1. open FEM/BDC shell, find out where the 95128/95256 chip is, read EEPROM dump via BDM programmer
  2. load original EEPROM dump and save special EEPROM dump, write special EEPROM dump back to the 95128/95256 chip
  3. restore FEM/BDC shell, provide -12v and connect it

step 3:

  1. this operation requires connecting FEM/BDC on the bench, and make sure you finish step 1 ans step 2

step 4:

  1. open FEM/BDC shell, write original EEPROM dump (read step 2) back to the 95128/95256 chip
  2. restore FEM/BDC shell and connect it

step 5:

loading coding file (read step 1), write to FEM/BDC , finish FEM/BDC programming

Attention please!!!

– You can directly backup/restore coding

– You have to pre-setup the FEM/BDC module before deleting/adding keys or resetting keys

– You’ll be told other tools need to be used first to program the FEM/BDC system, then setup FEM/BDC via VVDI2. It happens when you do FEM/BDC key learning, and you don’t have a working software version

– You’d better not close the VVDI2 interface when you pre-setup FEM/BDC

– You need do with 95128(FEM) or 95256(BDC) chip when pre-setup FEM/BDC

Note: there are two 8-pin chips; do not disassemble the wrong chip; better refer to the wiring diagram

– You must restore original EEPROM data, restore coding when pre-setup FEM/BDC. If you fail to restore coding or the remote cannot start or something wrong with the window (or other failures probably) after coding restore and FEM/BDC installation, please use other tools to do re-coding FEM/BDC

– Ask tech support for help, if the replay sounds continuously after supplying power to the FEM/BDC. Usually, it needs programming.


4. Yanhua BMW FEM key programmer add a new key

There are 5 steps for you to have Yanhua BMW FEM/BDC programmer add/program a new key.

Step 1: backup (read) coding data

Step 2: update/program ECU

Step 3: program/learn (add) key

Step 4: restore (write) coding data

Step 5: delete keys disabled

Step 1: backup (read) coding data

Cut off the power supply


Disassemble FEM

Yanhua-bmw-fem-programmer-add-new-key-(2) Yanhua-bmw-fem-programmer-add-new-key-(3)

Take photos before you disassemble the FEM for correct fuse location


Take apart the IC chip to read and save data

Yanhua-bmw-fem-programmer-add-new-key-(5) Yanhua-bmw-fem-programmer-add-new-key-(6)

Desolder the IC chip on the programmer board


Run CKM100 car key master softwareYanhua Auto Master Series to read data


Go to Specialized programmer, then IC chip: 95128

Read and save original 95128 EEPROM data


Then back to BMW FEM/BDC programmer software


Open the original 95128 data and write to generate new data


In Yanhua Auto Master Series, restore data


Write data successfully

Then desolder the IC chip to the FEM board


Then install the FEM to the car

Step 2: update/program ECU

Update ECU for 30min around

Voltage should not be lower than 13.0v

Yanhua-bmw-fem-programmer-add-new-key-(14) Yanhua-bmw-fem-programmer-add-new-key-(15)

Step 3: program/learn (add) key

Restore the original data with CKM100 car key master software

Install FEM and recover vehicle voltage


Put the working key here and read ISN codes


Record the working key ID to avoid deleting the incorrect keys


Delete the key used


Learn a new key


Put he new key here for key learning

Yanhua-bmw-fem-programmer-add-new-key-(21) Yanhua-bmw-fem-programmer-add-new-key-(22)


Step 4: restore (write) coding data

Write coding data successfully

Yanhua-bmw-fem-programmer-add-new-key-(23) Yanhua-bmw-fem-programmer-add-new-key-(24)

Successfully programmed a new key


Step 5: delete keys disabled

DO NOT delete the working key


Deleted keys disabled


Success!! Yanhua BMW FEM/BDC key programmer programmed a new key.

In summary,

all tools above (Lonsdor K518ISE, CGDIBMW, VVDI2, Yanhua BMW FEM/BDC key programmer) can work good in FEM/BDC programming. So, Lonsdor K518ISE vs CGDI BMW vs Xhorse VVDI2 vs Yanhua tool, which best for program BMW FEM/BDC? it depends on your budget and future use.

For VAG+BMW: Xhorse VVDI2 is the best solution.

For universal key programming: Lonsdor K518ISE key programming machine never fails.

CGDI BMW price: €539

Yanhua FEM/BDC programmer price: €449

Lonsdor K518ISE price: €1,025

Xhorse VVDI2: €1,735

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