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BMW I3 engine does not start after BDC replacement
03-10-2022, 20:56 PM,
Post: #1
XZBMW  BMW I3 engine does not start after BDC replacement
Hi all friends.
I have I3 with partially broken BDC, luckily it allows the engine to start. I bought through EBAY a used one with the same P/N codes, with VVDI2 read ISN from the original BDC of the vehicle. I changed VIN and re-keyed new key, with ISN read from original BDC, but it doesn't work, the engine doesn't start and Ista gives me error 21E921: inauthentic response electronic immobilizer. I checked again ISN added in the new key and it is identical to that of the original key.
The new key works perfectly, opens and closes regularly.
I can't understand why he behaves this way.
Hope you help me solve this problem.

Infinitely thank you very much.
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03-10-2022, 22:07 PM,
Post: #2
RE: BMW I3 engine does not start after BDC replacement
hi did you recode all car with e-sys ?

If this post helped you don't forget to press rep yes and thanks buttons under
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04-10-2022, 11:14 AM,
Post: #3
XZBMW  RE: BMW I3 engine does not start after BDC replacement
(03-10-2022, 22:07 PM)bm92 Wrote:  hi did you recode all car with e-sys ?
Yes of course I have coded the whole machine with ESYS,
Ista always gives me error 21E921: inauthentic response electronic immobilizer.
I thought it was the faulty key, I redid another key, always with the same ISN as the original key, but same problem. 
I don't understand why.
I don't think the problem is VVDI2, as I've worked on BDC 07-17 before and it worked beautifully.
This machine is both electric and thermal, I would like to try to read the ISN of EDME or EME to compare it with that of the key, but I really have no idea how to do it.
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04-10-2022, 13:11 PM,
Post: #4
RE: BMW I3 engine does not start after BDC replacement
If your original BDC can still communicate with VVDI2. You can clone the data (isn, key, vin...) to the new BDC. You do not need to make a new key

- Secure coding (NCD 2.0) fit to FA changed (Typschlussel, Serie, Region...).
- ID8.5 (SFA) conversion/ change region map.
- Virgin Kafas4, MRR, RAM used.
- Mgu patch, fsc custom match to vin, remove CP.
- Reset ISN 7DTC, 8HP for F, G serie (include EGS7).
- Write ISN MG1/MD1 with remotely.
- Carplay/Android Auto MGU with/without ATM (6AE).
Skype live:laquangksxd
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04-10-2022, 15:19 PM,
Post: #5
XZBMW  RE: BMW I3 engine does not start after BDC replacement
In truth I did not think to read all the DUMP via VVDI2 to perform the clone, in the hurry I only managed to read ISN from BDC via the key, it was partially functional, I tried to reconnect to the original BDC partially functional with VVDI2, now it does not communicate.
It would be nice to read ISN from EDME or EME to compare it, but I don't really know how to do it.
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