XTOOL M821 Adapter Benz All Keys Lost Fast Calculation Adapter for KC501/X100 Pad3/X100 Max Key Programmers

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19.5cm*9.5cm*8cm ( Inch: 7.66*3.73*3.14 )
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With XTOOL M821 Adapter, you can save as much as 65% of the calculation time on the process, or save you from plugging the key emulator in and out for hundreds of times.

XTOOL M821 Benz All Keys Lost Adapter for KC501/X100 Pad3/X100 Max Key Programmers 


M821 Introduction
Mercedes-Benz All Keys Lost Communication Adapter is used for finishing and optimizing all key lost programming for multiple Mercedes-Benz modules.

With M821 Adapter, you can save as much as 65% of the calculation time on the process, or save you from plugging the key emulator in and out for hundreds of times.

M821 Adapter needs to be used with advanced XTOOL Key Programming Devices eg: X100 Pad3/X100 Max and KC501 Key Programmer.

M821 Adapter Description

1. OBD-16 port: Used to connect to J1Z02_BENZ communication cable or connect to EIS/EZS modules via DuPont cables.
*Caution: Don't connect to the OBD port on the car directly.
2. Status Light: Shows the power status of the adapter. When the red lights are on, that indicates the power is on.
3. Comm Light: Shows the communication status of the adapter. When the blue lights are on, that indicates the adapter is communicating with the tablet.
4. DB15 port: Used to connect to the main cable of XTOOL tablets.
*Note: Before connected to M821 Adapter, please disconnect the OBD2-16 connector from the main cable.

Supported EIS Modules:

  • W164 (Old)
  • W166
  • W204
  • W212 (new)
  • W164 (new)
  • W216
  • W221
  • W211

Accessories Needed:

Xtool KC501


Connection Method

1. Connect KC501 to the device via USB.
2. Connect Mercedes-Benz IR emulator onto KC501.
3. Disconnect the OBD2 connector from the main cable, then connect the device (or the VCI box) with the M821 Adapter using the main cable.
4. Connect 12V power supply onto the main cable.
5. Connect the EIS/EZS module with the M821 Adapter using the J1K02_BENZ cable. Please check the device for connection details.

*Note: Please check the pictures in the device when connecting M821 Adapter and EIS/EZS module via J1K02_BENZ cable.
*Note: The Mercedes-Benz IR emulator should be plugged into the slot of the module when operating.
*Note: For devices which comes up with a VCI box, connect the M821 Adapter with the VCI box using the main cable, and keep the VCI box connected with the device via Bluetooth. You can check the connection details for such devices in the device.

Package List

M821 Mercedes-Benz AKL Adapter
J1K02_BENZ Wiring Harness
M821 Quick Guide


About Delivery

EU Warehouse Shipping: 3-5 working days. We have stocked up hot sale items in EU(Czech) Warehouse ,which is more convenient for you. Free TAX, faster shipping with cheaper price. 

Yanwen Express:  9-14 working days ,we will prepay the tax,then do not need customers to pay tax for most european counties
( We will send by Yanwen Express by default because of EU high Customs tax. If Customers need the faster DHL shipping method and willing to pay the high tax .Pleasee leave message to us in time after placing the order)

DHL Shipping: 3-5 working days, To help you clearance we will help declare a lower price on the invoice. If address is remote area, customer need pay remote freight or we will ship by Normal Post or Yanwen Express.

1.All of the items will be shipped to PAYPAL Shipping Address,please confirm your address on PAYPAL before you buy.
2.Your order will be usually shipped out the same or next business days once the payment is made, except on weekends and holidays.

Contact information:

Email: Sales@DiagOBD2.de
Skype: diagtool.de
Mobile:+86 15223201143
WhatsApp: +86 15223201143

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