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

Brand: Xtool Item No. SK386-B In Stock. History 234 sold.

Latest price: US$88.00
Buy Now: US$79.00 10% off
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Free Shipping Standard Flat Rate Shipping ServiceEstimated delivery time: 7-20 working days.See details »
16.5cm*14.3cm*4.3cm ( Inch: 6.5*5.63*1.69 )
Return for refund within 30 days,buyer pays return shipping. Read details »

Product Description

XTOOL M821 Benz All Keys Lost Adapter is used for finishing and optimizing all key lost programming for multiple Mercedes-Benz modules, you can save as much as 65% of the calculation time on the process

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

Xtool M821 Features

  • Support all key lost programming for multiple Mercedes-Benz modules.
  • Easy to use and save time, no need to plug the key emulator in and out 


  • Accessories Needed:  Xtool KC501X100 Pad3
  • Before connecting to M821 Adapter, please disconnect the OBD2-16 connector from the main cable.
  • 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: This shows the power status of the adapter. When the red lights are on, that indicates the power is on.
3. Comm Light: This 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 being connected to the 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

How to use Xtool M821 Adapter

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


  • The Mercedes-Benz IR emulator should be plugged into the slot of the module when operating.
  • Please check the pictures in the device when connecting the M821 Adapter and EIS/EZS module via J1K02_BENZ cable.
  • For devices that come 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.

XTOOL M821 Adapter
Package List

 1pc x M821 Mercedes-Benz AKL Adapter
1pc x J1K02_BENZ Wiring Harness
1pc x M821 Quick Guide 


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Shipment Option and Delivery Time In OBD2eshop

 1. Shipment from Shenzhen/ Hongkong warehouse 

 1)DHL Shipping and Other Express Service:
  • Take About 5-7 working days
  • DHL will be the default delivery method
  • To help you clearance we will help declare a lower price on the invoice to help clearance.
  • If address is remote area, you need pay remote freight 45 USD or we will ship by Normal Post or Yanwen/EMS/Aramex Express.
  • For some eu countries, there might be customs duty problem, if you have any special rquest on this, you can email to inform us your suggestions.
 2)Yanwen Express: 
  • Take About 7-10 working days, No Tax Problem
  • Usually No Tax for European Countries or Remote Area. The tax was pre-paid, when package reached, there's no tax no extra fee for customers.
  • Due to high custom tax in European Countries, Like CanadaGermany, Greece, Romania, Sweden, France,etc, we will use Yanwen express as first option, if you will need faster DHL shipment, please contact us, thank you.
 3)Normal Registered Airmail Post way
  • Take About 10-16 working days, Sometimes will be 20 days. 
  • Registered Airmail Includes Netherlands Post, USPS Post, Singapore Post, Hongkong Post, etc
  • Order amount less than 150USD, and package weight less than 2KG will be sent by Registered airmail. 
  • But if you feel it is really slow, and want us to send by DHL, you can choose "Premium Delivery" and pay for the extra shipping for express service. finally we will send it by DHL. 
 2. UK, US, EU Warehouse Shipping: 
  • Item title marked "Ship from US
  • Take About 3-5 working days, Free TAX, faster shipping with cheaper price. 
  • Note: If US/UK Stock sold out, your order will be shipped from China via DHL or YANWEN (No Tax) by default.
  • We have stocked up hot sale items in US, UK, Amazon US, and EU Warehouse, which is more convenient for you.
  • EU Warehouse was located in Germany/Czech and it only can ship to EU country: 
    Germany, France, Spain, Netherlands, Finland, Sweden, Austria, Belgium, Bulgaria, Croatia,
    Czech Republic, Denmark, Estonia, Greece, Hungary, Ireland, Latvia, Lithuania,Luxembourg,
    Malta, Poland, Portugal, Republic of Cyprus, Romania, Slovakia, Slovenia,5-7 DaysRoyal Mail/ DHL
After-sale service:
We can offer you lifetime customer service and tech support. If you have any problems, please Provide error image or video to show the problem, and kindly describe it in detail, technician will try their best to help you solve the problem. If there are no solution, you can return it for refund or get a new one for replacement.

 For any question, please contact us at:
OBD2EShop OBDII tool online supplier
  • Accepting bulk purchases, We can Offer you wholesale price.
  • OBD2EShop is a OBDII tool online supplier providing best-quality ECU chip uning tools, car diagnostic tools, OBDII Code scanners, car key programmers, heavy duty scanners, locksmith tools etc. 
  • Besides, we are the agent for many original brand such as Autel, Xhorse, OBDstar, VXdiag, XTOOL,Launch,CGDI, Yanhua ect.