Ford 5-Button Smart Key – M3N-A3C108397 – 433.92 MHz – ID49

Ford 5-Button Smart Key – M3N-A3C108397 – 433.92 MHz – ID49

Aftermarket replacement 5-button smart key for select Ford vehicles equipped with the M3N-A3C108397 proximity and push-to-start system.

This smart key operates at 433.92 MHz FSK and features an ID49 / NCF29A1-compatible HITAG PRO transponder system. The remote provides Lock, Unlock, Remote Start, Rear Access, and Panic functions.

The Rear Access function varies by vehicle application and may operate the trunk, power tailgate, or rear hatch.

Always verify the original FCC ID, IC number, frequency, button configuration, OEM part number, and vehicle application before ordering or programming.

Key Features

• FCC ID: M3N-A3C108397
• IC: 7812-A3C108397
• Frequency: 433.92 MHz FSK
• U.S. Nominal Frequency: 434 MHz
• Transponder Chip: ID49
• Chip Configuration: NCF29A1-compatible aftermarket
• Transponder Technology: HITAG PRO-compatible
• Transponder Security: 128-bit
• Button Count: 5
• Button Layout: 4+1
• Button Functions: Lock / Unlock / Remote Start / Rear Access / Panic
• Rear Access Function: Trunk / Tailgate / Hatch – application dependent
• Key Type: Smart Key
• Proximity / Keyless Go: Yes
• Push-to-Start: Yes
• Battery: CR2450 
• Emergency Key Profile: HU101
• Emergency Key Included: Yes
• Manufacturer Type: Aftermarket
• Condition: New

Product Information

• Compatible Make: Ford
• Application Type: Smart Remote / Proximity / Immobilizer
• Vehicle System: Keyless Go / Push-to-Start
• Transponder: ID49 / NCF29A1-compatible aftermarket
• Transponder Technology: HITAG PRO-compatible
• Frequency: 433.92 MHz FSK
• Power Source: Battery Powered
• Battery Size: CR2450
• Emergency Key Profile: HU101
• Emergency Key Included: Yes
• Programming: Dealer / Locksmith Programming Required
• Remote Features: Keyless Entry, Proximity Entry, Power Lock, Remote Start, Rear Access, Panic Mode

Part Number Information

 

Ford Mustang family

• 164-R8347
• 5945957
• PR3T-15K601-BA
• PR3T-15K601-BB

Ford F-150 family

• 164-R8370
• 5946270
• RL3T-15K601-BA

These correspond to the F-150 five-button Tailgate / Remote Start configuration.

Ford Expedition family

• 164-R8355
• 5946046
• PL1T-15K601-GA

These correspond to the Expedition five-button Hatch / Remote Start configuration.

Vehicle Compatibility

Ford

• F-150: 2023–2025
• Mustang: 2023–2024
• Expedition: 2023

For Ford F-150, the corresponding U.S. M3N-A3C108397 / ID49 / 434 MHz family is also independently documented through 2025, with Lock / Unlock / Tailgate / Remote Start / Panic.

For Ford Mustang, U.S. suppliers actually extend the exact FCC family to 2025, but they do so under the separate PR3T / 164-R8347 / 5945957 part-number family. 

For Expedition, U.S. references support M3N-A3C108397 through 2024 and even 2025 under the 164-R8355 Hatch configuration

Important Rear Access Button Note

 

Button Function Note: The Rear Access button function varies by vehicle application and may operate the trunk, tailgate, or rear hatch. Verify the original FCC ID, button configuration, and part number before ordering.

 

Programming & Compatibility

This smart key requires professional programming to the vehicle's immobilizer and proximity system before use.

The ID49 / HITAG PRO-compatible transponder and remote functions must be registered using compatible Ford locksmith or dealer programming equipment.

No standard customer onboard programming procedure should be expected for these newer Ford applications.

The HU101 emergency insert key must also be cut to match the vehicle before mechanical use.

Because M3N-A3C108397 is used across several Ford smart-key configurations, compatibility should not be determined from FCC ID alone. Verify the original FCC ID, frequency, button configuration, part-number family, and vehicle application before programming.