How to Add VAG 5C 5D Key with Xhorse VVDI Key Tool Plus?

 

Xhorse VVDI Key Tool Plus now supports reading original VAG MQB49/5C and 5D key data to add a spare key function.

 

Requirement:

Update Key Tool Plus IMMO Database to V142, PROG database to V187 and newer version.

What Xhorse device supports this function?

Xhorse VVDI Key Tool Plus with RH850 MQB adapter and MQB license activation

Other Xhorse devices don’t support 5C 5D function yet.

 

What keys should be used?

For 5C type you can use Xhorse XS smart remote or original key.

For 5D system, must use original key.

 

How to add VAG MQB49 5C or 5D key with vvdi key tool plus?

Go to IMMO Programming- VW- Select by type- MQB instrument- Read key to obtain data – MQB49 (5C) key disassembly reading or MQB49 (5D) key dismantling and reading.

Step 1: Read original key data.

Either solder wires to original key PCB (Xhorse will show you the key wiring diagrams) or use solder free adapter (coming soon) to read key data.

 

Step 2: Generate dealer key (by uploading key file)

Step 3: Learn key in car

For some 2023+ models you may also need to unlock SFD gateway before learning key in car.

 

 

Xhorse vs Keydiy VAG 5C and 5D function:

Both support reading original key data to add spare key. Cannot do All keys lost.

Keydiy will generate a service code to learn it. It will not retrieve CS and PIN code.

Xhorse will save original key data as file. If upload key data file you will get CS and PIN.

VAG MQB48 vs MQB49 5C and 5D

MQB48, MQB49, 5C, and 5D refer to different generations/levels of immobilizer (IMMO) systems and dashboard types used in Volkswagen Group (VAG) vehicles on the MQB platform (VW, Audi, Skoda, Seat, etc.).

 

What’s the difference between VAG MQB48, MQB49 5C and 5D?

 

Type	Chip/Platform	Generation / Year range (approx.)	Security Level	Add Key	All Keys Lost (AKL)	Typical Models / Notes
MQB48	NEC35xx (locked)	Older MQB (≈2015–2019)	Medium	Yes	Yes with sync data	Many Golf 7, Tiguan, Octavia, A3 (pre-2020)
MQB49	RH850 / R7F (newer)	Newer MQB (≈2019.10+)	High	Yes	dealer only	Many 2020+ models, e.g. newer Polo, T-Roc, etc.
5C	RH850 dashboard type (PCJ mark)	Same as MQB49 (newer clusters)	High	Yes	Very limited	Often overlaps with MQB49, e.g. some 2020+ dashboards
5D	Newest RH850 dashboard	Latest (≈2021–2025+, e.g. Golf 8 facelift)	Highest	Yes	dealer only (ODIS + OEM key)	Golf MK8 (some), newest Audi/VW high-end models

 

Key Points Explained
MQB48 – Classic / older system (NEC35xx chip).
Easiest to handle for add key with Xhorse VVDI/Keydiy/Yanhua ACDP etc tools — requires MQB48 adapter or MLB/MQB48 adapter.

MQB49 – Newer, stronger IMMO (RH850 processor). Introduced around late 2019. You can usually add a key if you have at least one working key (often needs online calculation, sometimes fee is involved. For example, Keydiy KD-X4 will add key MQB49 if you have MQB license activated. All keys lost is much harder — many cases still dealer only.

5C – Basically the dashboard/cluster type that corresponds to MQB49 level (you see 5C when you read the cluster). Almost the same as MQB49 in terms of key programming difficulty. Many people write “MQB49/5C” together.

It’s common on mid-cycle refreshes from ~2020 onward, especially compact/mid-size SUVs and hatches like the Tiguan facelift, Polo facelift, and T-Roc.

5D – Even newer dashboard/cluster generation (highest security). 5D is the even newer evolution (higher crypto/security), seen on the newest platforms like Golf MK8 (2020+ but especially post-2021/2022 builds) and some 2023–2025+ refreshes of other models.

Require OEM key to make dealer keys. Some tools can change mileage on 5D, but full key programming (especially AKL) is not widely supported yet by aftermarket tools in 2026.

The 5D key PCB features a different chip and also includes an additional acceleration sensor (keyless entry sensor).

It is not interchangeable with the 5C key. Commonly used in the VW Golf 8, ID.3, ID.4, and electric vehicle series.
Adding and generating keys can only be done using the original key.

The PCB comes with either a black coil or a white coil, depending on the production date, with the white coil being produced more recently.

In short (simple version):
MQB48 = older → easier, full support for add key & AKL (with sync data)
MQB49 = newer → harder, usually only add key (with working key)
5C = dashboard name for MQB49 level
5D = newest dashboard → hardest

How to Add Benz FBS4 Keyless Smart Key with Keydiy PAK09

How to add new Mercedes Benz FBS4 full keyless keys fast and easy with the Keydiy PAK09 Phone as Key — no more waiting 2–4 weeks!

The job can be completed on the same day.

Tools used:

• Original car key
• PAK09 Phone as Key BBA Box
• Keydiy ZB smart remote
• Keydiy KD-X4 App

 

Instruction:

1. Remove the PCB from the original car key.

2. Open KD App, go to Learning Center- Help Center-Wiring Diagrams for original remotes.
Find a diagram that matches your original remote.

Follow the wiring diagram to solder the PCB properly.

Remove the back cover of the Keydiy PAK09 phone as key box.
After soldering, insert the adapter cable connector into the corresponding trigger connector.
Place the soldered PCB into the PAK09.
Close the back cover of PAK09.

Turn on the Keydiy PAK09.
Power button: short press once, then long press for 3s.
Indicator light flashes, indicating successful power-on.

3. Generate the corresponding program for PAK09 to add one more physical car key.
Support generate with KD B/ZB series remotes. Here we use KD ZB remote.
Place the KD ZB remote to be generated into KD-X4.
Run KD App.
Go to Remote Function- Vehicle Remote- Select the corresponding remote control program.
Generate KD ZB smart remote.
Generate remote successfully.

Go to Phone as Key App.
Click Setting icon on the corner.
Click Device Management.
Click icon to start scanning the device.
Select the PAK kit you want to connect.

The default password is 000000.
First-time repairing requires password modification.

Start adding key.
Click Setting on the right corner.
Scroll down and select Key Management.
Click Enter matching mode.

Before the countdown ends, press any key on the remote to add the key.
You can add up to 6 physical keys.
Now we have successfully add 1 spare FBS4 key.

NOTE: You cannot directly generate KD FBS4 remote. Must pair with PAK09 Phone as Key first.

Add Seat ibiza 2019 MQB49 5C Key with Keydiy KD-X4

 How to add Seat ibiza 2019 MQB49 5C key with Keydiy KD-X4 programmer?
OEM used key (original from another car).
Everything works perfectly, remote works on both.
But on used OEM can’t change ID, so You can’t go to dealer with this key.
This key is not a copy like BMW.
You have to solder to write data to the “new” key.
And then perform key learning in car.
(Or can generate dealer key wireless on KD ZB key and learn).

How to Add VAG 5C 5D Key with Keydiy KD-X4 Step by Step?

 Tutorial: add VAG VW Audi MQB49/5C and 5D key using Keydiy KD-X4 key programmer step-by-step.

 

Tools used:

• Keydiy KD-X4 programmer
• Original car key
• 5C 5D dedicated cable or KD circuit board to read key data
• New key to be programmed (5C: original key or KD ZB MQB smart remote;  5D: Must use original key)

Requirement:
Update Keydiy App version to V8.7.1 and KD-X4 firmware version 1.53 and higher.

 

Procedure:

Step 1: Read key data

Select IMMO Programming-VW- 5C/5D Immobilizer Systsem- Start execution
Select Read original car key and generate a dealer key.

Check key wiring diagram.

You’ve got two ways to connect the original key:

1. Use 5C 5D circuit interface board. Remove original key and install the PCB into the circuit board, then connect the circuit board with KD-X4 main unit.

2.Use wire soldering method. Connect original key with a dedicated cable or a modified cable.

Read chip data.

After a successful read, it will generate a service code. Take a screenshot of the service code.

Step 2: Generate dealer key

Then start generate dealer key.
Put a KD ZB remote to the KD-X4 coil.
Generate KD ZB remote successfully.

Step 3: Learn Key
Then we learn key in car.
Connect KD-X4 programmer with the vehicle via OBD.
Go to IMMO Programming-VW- 5C/5D Immobilizer Systsem- Start execution
Select Key Learning function.
Enter number of keys to be learned. All keys need to be learned.

It will ask if it is a smart key, here click Yes. (Click No if it is not a smart key).

Place the original car key close to the induction coil.
Open the vehicle hood.

Confirm vehicle VIN

Keydiy KD-X4 will ask enter the KD service number you have obtained in Step 1.

Select the corresponding service code and confirm.

Learn 1st key successfully.
This indicates that the first key has been successfully learned.

Then stick the second key to the induction coil.
Don’t turn off the ignition until learning is complete.
Key learning completed.

Turn off the ignition switch, wait 5 seconds and then turn ignition switch on.

Key learning finished. Test the remote control and proximity function.

Note: If you perform key learning on 2024 and 2025 models, you will need to unlock SFD gateway before learning key.

http://blog.obdii365.com/2026/01/15/how-to-add-vag-mqb49-5c-5d-key-with-keydiy-kd-x4/