Subaru OEM Remote Head Key (FCC ID 12BBY) – ID82-G / TOY48 Guide

Operating at 315 MHz with an ID82-G transponder, the Subaru OEM Remote Head Key (FCC ID 12BBY) integrates remote-lock functionality and immobilizer authentication into a single housing. This unit carries the TOY48 uncut blade profile and is registered under FCC ID 12BBY, confirming its compliance for radio-frequency operation within the United States. Inside the key head sits the ID82-G chip responsible for cryptographic handshake with the vehicle’s immobilizer ECU. The Subaru OEM Remote Head Key (FCC ID 12BBY) is validated for the Subaru BRZ across model years 2012 through 2020, and a correctly enrolled device will start the engine only after the immobilizer confirms transponder authenticity.

Subaru OEM Remote Head Key (FCC ID 12BBY) – Technical Specifications

The following table consolidates the verified specifications for this remote head key. All values are drawn exclusively from confirmed data; unknown parameters are omitted.

ID82-G Transponder and Immobilizer Pairing

The ID82-G chip embedded in this remote head key is part of a rolling-code transponder family used across several Subaru platforms during the 2010s. When the key is inserted into the ignition barrel, the immobilizer antenna ring energizes the transponder, which responds with an encrypted authentication token. The vehicle’s immobilizer ECU validates that token against stored credentials before enabling the fuel injection and ignition circuits. If the transponder response fails — due to a damaged chip, incorrect programming, or a cloned key — the engine will crank but not start.

Programming an ID82-G transponder to a Subaru BRZ typically requires a diagnostic tool capable of accessing the immobilizer module. Depending on the year and trim, the procedure may involve reading the existing key data from the ECU, registering the new transponder ID, and confirming enrollment through a start-cycle verification. Locksmiths working with this chip should confirm tool compatibility before beginning the procedure, as not all aftermarket programmers support the ID82-G protocol natively.

TOY48 Blade Profile and Mechanical Cutting

The TOY48 keyway — also encountered on certain Toyota and Scion platforms — features a high-security profile with side-milled cuts. On the Subaru BRZ, this blade engages the ignition lock cylinder and door lock. Cutting a replacement blade requires either a code-cut from the key code (obtainable via VIN from Subaru dealers) or an impression/decode of the existing lock.

Locksmiths should note that the TOY48 blank must match the OEM profile precisely. A slightly out-of-spec cut can bind inside the wafer-style cylinder, causing premature wear on both the key and the lock. When duplicating from an existing key, verifying depth and spacing against TOY48 specification charts helps avoid callbacks. The metal key blade in the Subaru OEM Remote Head Key (FCC ID 12BBY) is factory-uncut, so a cutting operation is always necessary before the fob can mechanically operate the vehicle.

315 MHz Remote Functionality

The remote portion of the key transmits at 315 MHz, the standard frequency for North American-market Subaru vehicles of this era. This RF signal handles lock, unlock, and trunk/hatch release commands — though the exact button layout on this particular unit is unconfirmed. The 315 MHz signal uses rolling-code encryption, meaning each button press generates a unique transmission that the vehicle’s receiver module validates and then discards. This prevents simple replay attacks.

If the remote function stops working while the mechanical key and transponder still operate, the issue is usually a depleted battery inside the fob housing. Replacing the coin-cell battery and re-syncing the remote — often accomplished by a simple lock-unlock cycle at the driver’s door — typically restores wireless functionality without reprogramming.

Vehicle Fitment: Subaru BRZ (2012–2020)

The confirmed application for the Subaru OEM Remote Head Key (FCC ID 12BBY) is the first-generation Subaru BRZ, spanning model years 2012 through 2020. The BRZ was co-developed with Toyota (which sold its variant as the 86/GT86), and the shared platform explains the TOY48 blade profile appearing on a Subaru product. Despite the mechanical commonality, the transponder enrollment and remote pairing are handled by Subaru’s own immobilizer architecture, so programming procedures specific to Subaru apply.

Owners of a 2012–2020 BRZ seeking a replacement should verify the FCC ID printed on the back of their existing key to confirm that 12BBY matches. Subaru used different FCC IDs across model lines and sometimes across production runs within the same model, so cross-referencing before ordering avoids returns and delays.

OEM vs. Aftermarket Considerations

Because this is a Subaru OEM part, the housing, electronics, and blade blank are manufactured to factory specifications. Aftermarket alternatives exist at lower price points but may differ in shell fit, button feel, or transponder chip quality. When the fob is aftermarket, the transponder must still be an ID82-G type to pair with the BRZ immobilizer — a generic 4D or 4C chip will not authenticate.

For automotive locksmiths, stocking the OEM unit or a confirmed-compatible aftermarket shell pre-loaded with the correct chip streamlines on-site service. The key can be cut by code and programmed at the vehicle, eliminating the need for a dealer visit and reducing turnaround time for the end customer.

When to Contact a Locksmith

Vehicle owners who have lost all keys, need a spare programmed, or have a key with a cracked housing should contact an automotive locksmith experienced with Subaru immobilizer systems. The ID82-G transponder requires tool-based registration, and the TOY48 blade requires precision cutting equipment. A qualified locksmith can handle both operations on-site, providing a fully functional key without towing the vehicle to a dealership.