Do I need a tablet to use this set?

Yes. It only works with an XTOOL X100 PAD3, X100 MAX, or D8/D9 series device. The KC501 and M822 are add-ons, not a complete tool on their own.

Can I plug the M822 into the car's OBD port?

No. The OBD-16 port on the M822 connects to the J1Z02_BENZ cable or to EIS/EZS modules with DuPont cables. The instructions warn against connecting it to the car's OBD port directly.

What does the KC501 do on its own?

It reads and writes MCU and EEPROM chips, reads remote frequency, and handles Mercedes infrared keys. It connects to a PC or tablet over USB.

Does it work on cars other than Mercedes-Benz?

No. The set is built for Mercedes-Benz key and EIS/EZS work. Treat it as a brand-specific tool.

The set is the KC501 and the M822 for Benz adapter. No battery is included, so plan on USB or tablet power.

Is it worth it over a full key programmer?

If you already run XTOOL tablets and do Mercedes lost-key jobs, it adds infrared and EIS/EZS coverage. If you need one tool for many brands, a full programmer fits better.

XTOOL KC501+ M822 for Benz Car Key Fob Pr0grammer Set

Best price now

$539.10at WalmartChecked 4 h ago

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XTOOL KC501+ M822 for Benz Car Key Fob Pr0grammer Set

Best price now

$539.10at WalmartChecked 4 h ago

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Lowest price today: $539.10 at Walmart (checked Nov 12, 2026).

Our take on the XTOOL KC501+ M822 for Benz Car Key Fob Pr0grammer Set

The XTOOL KC501+ M822 is a key programming set for Mercedes-Benz work. The KC501 handles reading and writing MCU and EEPROM chips, reads remote frequency, and covers Mercedes infrared keys, while the M822 adapter links to EIS/EZS modules for all-keys-lost jobs. It is not a standalone tool: it needs an XTOOL X100 PAD3, X100 MAX, or D8/D9 tablet. That makes it a specialist add-on for locksmiths and workshops already on XTOOL hardware, not a first scanner for a general mechanic.

Best forLocksmiths doing Mercedes all-keys-lost jobsShops already owning an X100 PAD3, MAX or D8/D9Bench work on MCU and EEPROM chipsMercedes infrared key and remote frequency work

Pros

Covers Mercedes infrared key read and write
Reads and writes MCU and EEPROM chips
M822 adapter works on EIS/EZS modules
Connects to a PC or the XTOOL tablet
Cuts repeated emulator plugging on lost-key jobs

Cons

Requires a separate XTOOL X100 PAD3, MAX or D8/D9 tablet
M822 OBD-16 port must not go to the car's OBD port
No battery or charger included
Mercedes-specific, so no use on other brands

XTOOL KC501+ M822 for Benz Car Key Fob Pr0grammer Set prices at every store

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XTOOL KC501+ M822 for Benz Car Key Fob Pr0grammer Set price history

Lowest price we've seen: $539.10 on Nov 12 at Walmart. Tracked across 1 store since Nov 12.

About the XTOOL KC501+ M822 for Benz Car Key Fob Pr0grammer Set

The XTOOL KC501+ M822 set is a key programming tool for Mercedes-Benz cars. It is used for finishing and optimizing all-keys-lost programming. It can save up to 65% of the calculation time, and it removes the need to plug the emulator in and out hundreds of times.

The set must be used with an XTOOL X100 PAD3, X100 MAX, or D8/D9 Series device. The KC501 reads and writes, reads remote frequency, and generates dealer keys. It also reads and writes MCU/EEPROM chips and Mercedes infrared. It connects to a PC or tablet.

The M822 adapter has an OBD-16 port, a DB15 port, a status light, and a comm light. The OBD-16 port connects to a J1Z02_BENZ communication cable, or to EIS/EZS modules through DuPont cables. Do not connect it directly to the car's OBD port. The DB15 port connects to the main cable of XTOOL tablets. The red status light shows power is on. The blue comm light shows the adapter is communicating with the tablet.

Brand: XTOOL
Model: KC501+M822 for Benz
Vehicle make: Mercedes-Benz
Compatible devices: XTOOL X100 PAD3, X100 MAX, D8/D9 Series
Functions: Read and write, read remote frequency, generate dealer keys, read and write MCU/EEPROM chips, read and write Mercedes infrared
Connectivity: USB to device, PC or tablet connection; Bluetooth for devices with a VCI box
Adapter ports: OBD-16 port, DB15 port
Indicator lights: Red status light (power), blue comm light (communication)
Power: 12V power supply connected to the main cable
Power type: Battery
Batteries included: No
Weight: 1.2 lb
Color: Black
Type: Professional scanner, multifunction

Specifications

Automotive diagnostic tool type: Professional ScannersSource
Brand: XTOOLSource
Compatible cars: Wide Vehicle CompatibilitySource
Vehicle fitment type: UniversalSource

Questions and answers

Do I need a tablet to use this set?: Yes. It only works with an XTOOL X100 PAD3, X100 MAX, or D8/D9 series device. The KC501 and M822 are add-ons, not a complete tool on their own.
Can I plug the M822 into the car's OBD port?: No. The OBD-16 port on the M822 connects to the J1Z02_BENZ cable or to EIS/EZS modules with DuPont cables. The instructions warn against connecting it to the car's OBD port directly.
What does the KC501 do on its own?: It reads and writes MCU and EEPROM chips, reads remote frequency, and handles Mercedes infrared keys. It connects to a PC or tablet over USB.
Does it work on cars other than Mercedes-Benz?: No. The set is built for Mercedes-Benz key and EIS/EZS work. Treat it as a brand-specific tool.
What is in the box?: The set is the KC501 and the M822 for Benz adapter. No battery is included, so plan on USB or tablet power.
Is it worth it over a full key programmer?: If you already run XTOOL tablets and do Mercedes lost-key jobs, it adds infrared and EIS/EZS coverage. If you need one tool for many brands, a full programmer fits better.
Where is the XTOOL KC501+ M822 for Benz Car Key Fob Pr0grammer Set cheapest?: At Walmart, for $539.10, as of our latest check.