Mitsubishi OEM Smart Key Fob (FCC ID KOS2) – Key Details & Fitments

Operating at 433 MHz and housing a PCF7952 transponder, the Mitsubishi OEM Smart Key Fob (FCC ID KOS2) serves as the factory proximity entry and push-to-start device across several Mitsubishi Motors platforms. This unit is identifiable by FCC registration KOS2 and carries a MIT11 emergency key blade profile for mechanical backup access. Inside the fob sits the PCF7952 chip responsible for immobilizer handshake and rolling-code authentication with the vehicle’s body control module. Compatible vehicles span over a decade of Mitsubishi production, from compact hatchbacks to midsize crossovers. A correctly enrolled Mitsubishi OEM Smart Key Fob (FCC ID KOS2) will allow passive keyless entry, remote lock/unlock, and engine start authorization without inserting a physical key. Because this product is a genuine Mitsubishi OEM part, it mirrors the exact electrical and mechanical specifications of the unit delivered with the vehicle at the factory, meaning the fob meets original tolerances for signal strength, rolling-code encryption, and blade-cut accuracy.

Transponder and Frequency Specifications for the Mitsubishi OEM Smart Key Fob (FCC ID KOS2)

The PCF7952 transponder integrated into this smart key is a multi-function chip that combines a passive RFID immobilizer element with an active RF remote-control transmitter operating at 433 MHz. During engine start authorization, the vehicle’s immobilizer antenna ring energizes the passive transponder element embedded in the fob, reads the cryptographic response, and validates it against values stored in the ECU. Simultaneously, the 433 MHz active transmitter handles keyless entry commands — lock, unlock, and panic — at a range typical of UHF proximity systems.

The PCF7952 is well established in the Mitsubishi auto locksmith smart key ecosystem, and locksmiths familiar with this chip family will recognize its use of AES-based mutual authentication. Programming requires an advanced automotive key programmer capable of reading the immobilizer data from the OBD-II port and writing the new key’s credentials into the vehicle’s EEPROM or on-chip memory. Dealer-level diagnostic tools such as MUT-III can accomplish this, as can several respected aftermarket platforms that support Mitsubishi Remote Head Key (FCC ID MIT11R) – Key Details & F immobilizer systems from the late 2000s onward.

MIT11 Emergency Blade Profile

The MIT11 keyway is the mechanical backup integrated into the fob housing. When the smart key’s battery dies or the vehicle’s electrical system cannot power the passive entry antennas, the driver can extract the MIT11 blade from the fob body and use it to unlock the driver’s door manually. This blade also inserts into the ignition-adjacent slot found in certain Mitsubishi models, allowing the vehicle to detect the transponder at close range even without battery power.

MIT11 is a standard Mitsubishi high-security profile with side milling. Cutting requires either a code-cut from the vehicle’s key code (obtainable through Mitsubishi dealerships with proof of ownership) or duplication from an existing working key using a suitable key-cutting machine equipped with the correct MIT11 jaw or clamp. Locksmiths should verify the blade length and milling depth against OEM specifications to ensure smooth insertion and cylinder operation.

Validated Vehicle Fitments

The Mitsubishi OEM Smart Key Fob (FCC ID KOS2) is validated for the following Mitsubishi Motors vehicles:

• Mitsubishi ASX — model years 2010 through 2021
• Mitsubishi Lancer — model years 2008 through 2020
• Mitsubishi Mirage — model years 2012 through 2024
• Mitsubishi Outlander — model years 2012 through 2021

Each of these platforms uses the same 433 MHz proximity system and PCF7952 immobilizer architecture, which is why a single FCC ID covers such a broad range of models and years. However, trim-level variations may affect the number of buttons or cosmetic case design, so verifying the FCC ID printed on the back of the original fob is always recommended before ordering a replacement. If the original fob reads “KOS2” on its label, this is the correct part.

Programming Considerations for Automotive Locksmiths

Adding or replacing the fob typically requires an advanced diagnostic session through the vehicle’s OBD-II port. The general workflow involves the following steps:

1. Connect the diagnostic tool and access the Mitsubishi immobilizer module.
2. Read the current key data, including the number of keys already registered.
3. Initiate the key-learning or key-addition procedure.
4. Present each existing key (if available) and the new fob to the system within the timeout window.
5. Confirm successful registration by testing passive entry, remote lock/unlock, and push-to-start functionality.

Some model years within the fitment range may require a PIN code extracted from the immobilizer ECU or obtained from Mitsubishi’s dealer network. Locksmiths who regularly service Mitsubishi vehicles should maintain access to PIN retrieval resources, as this step is often the bottleneck in the programming workflow.

After programming, it is important to verify that the MIT11 emergency blade operates the driver’s door lock cylinder. On vehicles that have not had the mechanical lock exercised in years, the cylinder may be stiff. A small amount of graphite-based lubricant can restore smooth operation without attracting dust or debris the way oil-based products do.

OEM vs. Aftermarket Replacement Considerations

Vehicle owners considering a replacement for this device face the familiar OEM-versus-aftermarket decision. An OEM unit guarantees matching PCB layout, antenna tuning, and case dimensions, eliminating the risk of fitment issues or intermittent communication failures. Aftermarket alternatives exist and can offer cost savings, but verifying the transponder type (PCF7952) and frequency (433 MHz) is critical — a mismatch on either parameter will prevent the key from programming.

For owners who prefer the assurance of factory components, sourcing through an authorized Mitsubishi dealer or a reputable automotive locksmith who carries OEM stock is advisable. An experienced locksmith can also handle the full replacement process — cutting the MIT11 blade, programming the transponder, and testing all smart-key functions — in a single service visit, which saves time compared to the multi-appointment process some dealerships require.

When to Contact a Locksmith

Owners of the Mitsubishi ASX, Lancer, Mirage, or Outlander who need a replacement proximity key should contact a qualified automotive locksmith with Mitsubishi immobilizer programming capability. Mobile locksmith services are particularly convenient here because the vehicle does not need to be towed to a shop — the locksmith comes to the vehicle, cuts the blade on-site, and programs the fob through the OBD-II port. This is especially useful if the vehicle is at a residence, office parking structure, or other location where towing would be costly or impractical.