Aftermarket Smart Key Fob with ID6A Chip – Hyundai & Mazda Fitments

Built around an ID6A transponder chip, the Aftermarket Smart Key Fob – PCF7952A 315 MHz for Ford, KIA, provides keyless entry and push-button start functionality for a range of late-model Hyundai and Mazda vehicles. This unit bridges the gap between OEM cost and aftermarket accessibility, housing the same cryptographic handshake logic needed for immobilizer authentication. Inside the fob sits the ID6A transponder element, which handles the rolling-code exchange between the device and the vehicle’s body control module. Compatible vehicles across both brands share reliance on this transponder family for start authorization. A correctly enrolled Aftermarket Smart Key Fob will allow passive entry, remote lock and unlock, and engine ignition without inserting a physical blade into the ignition cylinder. The device also includes an integrated emergency key blade slot, standard among proximity-based smart keys for mechanical door access when the battery dies.

ID6A Transponder Technology in the Aftermarket Smart Key Fob

The ID6A transponder chip is a cryptographic element found across several modern vehicle platforms. Unlike older fixed-code transponders such as ID46 or ID48, the ID6A employs an advanced encryption protocol that pairs the key to the vehicle’s immobilizer system through a challenge-response authentication sequence. Each time the driver presses the start button or approaches the vehicle within proximity range, the body control module sends an encrypted challenge to the fob. The transponder responds with a calculated answer derived from a shared secret key established during the original programming procedure. If the response is valid, the immobilizer releases and allows the engine to crank.

For automotive locksmiths, programming an aftermarket unit with an ID6A chip typically requires a diagnostic tool capable of accessing the vehicle’s immobilizer module directly. The specific procedure varies between Hyundai and Mazda platforms, as each manufacturer implements the ID6A protocol within its own proprietary security architecture. Pin code extraction or on-board programming (OBP) may be necessary depending on the model year and trim level. Some vehicles require an initialization step that clears existing key data before new fobs can be registered, while others support additive enrollment where additional keys are written alongside existing ones.

Validated Vehicle Fitments

This smart key fob has been validated for use with the following Hyundai and Mazda vehicles. Fitment confirmation should always be cross-referenced against the vehicle’s VIN before ordering or programming, as regional trim differences can affect compatibility.

Hyundai Models

• Hyundai Elantra (2020) — The seventh-generation Elantra adopted proximity-based smart key systems across most trim levels. The fob provides passive entry for all four doors and the trunk, with push-button start standard.
• Hyundai Ioniq 6 (2022) — As Hyundai’s electric sedan platform, the Ioniq 6 uses a smart key system integrated with the vehicle’s advanced driver-assistance suite. The ID6A-equipped device handles both entry authorization and drive-mode activation.
• Hyundai i20 (2020) — The third-generation i20, primarily marketed outside North America, utilizes the same transponder family. Locksmiths working on this model should verify regional security configurations before programming.

Mazda Models

• Mazda CX-30 (2019) — Mazda’s subcompact crossover launched with a smart key system as standard on upper trims. The fob handles proximity unlock and push-button start.
• Mazda CX-50 (2023) — Designed for the North American market, the CX-50 uses a refined version of Mazda’s smart key architecture. Programming requires access to the immobilizer module via OBD-II.
• Mazda CX-60 (2022) — This mid-size crossover, available in select global markets, shares its smart key platform with several other Mazda models in this generation.
• Mazda CX-90 (2023) — Mazda’s flagship three-row SUV uses the same proximity key ecosystem. The device enables passive entry and start across all configurations.
• Mazda Mazda3 (2019) — The fourth-generation Mazda3 adopted a refined smart key system. Both sedan and hatchback variants accept the same fob hardware.

Programming Considerations for Locksmiths

Working with aftermarket smart keys across two distinct manufacturers presents unique challenges. While the ID6A transponder is the common element, the enrollment procedures differ substantially between Hyundai and Mazda platforms.

On Hyundai vehicles, key registration typically proceeds through the immobilizer control unit accessed via the OBD-II diagnostic port. Depending on the model, a security pin code may be required. Some Hyundai platforms support on-board programming using a sequence of existing registered keys, but this method is generally limited to situations where at least one working key is available. Advanced diagnostic tools from major locksmith equipment manufacturers provide guided procedures for these vehicles.

Mazda’s approach to smart key programming involves its own proprietary security layer. The CX-30, CX-50, CX-60, CX-90, and Mazda3 models from 2019 onward use a system that often requires server-based authentication or a specific dealer-level tool protocol. Aftermarket diagnostic platforms have progressively added coverage for these models, but locksmiths should verify that their tool’s firmware supports the specific model year before committing to a job. The Aftermarket Smart Key Fob must be properly initialized — a blank fob that has not been prepared for enrollment will not be recognized by the vehicle’s security module.

Battery replacement is straightforward on most smart key fobs. The housing typically separates with a flat-head tool or coin slot, revealing a standard CR-series coin cell battery. Replacing the battery does not erase the transponder pairing; the cryptographic data stored on the ID6A chip is non-volatile and persists through power loss.

OEM vs. Aftermarket: What Vehicle Owners Should Know

Dealership-sourced smart keys for both Hyundai and Mazda vehicles carry a significant price premium over aftermarket alternatives. An OEM fob typically costs two to four times more than an equivalent aftermarket unit, and dealer programming fees add to the total. The Aftermarket Smart Key Fob offers the same core functionality — proximity detection, remote locking, push-button start — at a fraction of the cost when programmed by a qualified automotive locksmith.

Vehicle owners should be aware that aftermarket fobs may differ slightly in housing finish, button feel, or logo placement compared to factory originals. These cosmetic differences do not affect the electronic performance of the device. The critical component — the ID6A transponder — operates identically regardless of housing origin. What matters is that the fob is correctly paired to the vehicle’s immobilizer system by a technician with the appropriate diagnostic equipment.

When selecting a locksmith for smart key programming, owners should confirm that the technician has experience with the specific vehicle platform. Hyundai and Mazda smart key systems each have their own procedural nuances, and a locksmith familiar with one brand may need additional tooling or software modules to service the other.

Emergency Mechanical Access

Like most proximity-based smart keys, this fob includes a hidden mechanical key blade designed for emergency use. If the fob’s battery dies or the vehicle’s electrical system is compromised, the blade can be extracted from the fob housing and used to manually unlock the driver’s door. This does not start the engine — it only provides physical access to the cabin. To start the vehicle with a dead fob battery, most Hyundai and Mazda models allow the driver to hold the fob directly against the start button or a designated reader location on the steering column, where the immobilizer can power the transponder chip inductively and complete the authentication sequence.