Hyundai Remote Key Fob OSLOKA-221T/230T/240T – Specs & Programming

By Mohammad H. Abdelhadi, ALOA-Certified Master Locksmith, mobile automotive locksmith. Reviewed by Ray Obar, Master Locksmith. Updated June 1, 2026.

Fitments for the Hyundai Remote Key Fob (FCC ID OSLOKA-221T/230T/240T) include the Hyundai Elantra (2000–2006) and the Hyundai Santa Fe (2000–2006). Across both of these platforms, the fob transmits remote lock and unlock commands on a 315 MHz carrier frequency, which was standard for Hyundai Motor Company vehicles sold in the North American market during this era. Each Hyundai Remote Key Fob (FCC ID OSLOKA-221T/230T/240T) pairs with the vehicle’s body control module through a rolling-code protocol, meaning a freshly obtained unit must be programmed before it will operate the door locks or trigger the panic alarm. Owners replacing the device should expect either a dealer-level scan tool procedure or, on some model years, a manual on-board programming sequence that involves cycling the ignition and pressing buttons in a timed pattern. When ordering a Hyundai Remote Key Fob (FCC ID OSLOKA-221T/230T/240T), confirm that the FCC ID printed on the back of the replacement shell matches one of the three dash-separated suffixes — 221T, 230T, or 240T — since aftermarket listings occasionally bundle unrelated housings under a single product page.

FCC ID Variants: OSLOKA-221T, 230T, and 240T

The triple FCC ID designation — OSLOKA-221T, OSLOKA-230T, and OSLOKA-240T — reflects the fact that Hyundai used slightly different internal circuit boards across production runs while keeping the external case geometry and button layout consistent. From a locksmith’s standpoint, all three variants operate at 315 MHz and follow the same programming workflow. The practical difference between the suffixes usually comes down to component sourcing and minor PCB revisions rather than any functional change in how the remote communicates with the vehicle. When sourcing replacements, matching the correct FCC ID to the vehicle’s original remote eliminates the risk of frequency mismatch or protocol incompatibility.

Hyundai Remote Key Fob (FCC ID OSLOKA-221T/230T/240T) Programming Procedure

Programming this remote into a 2000–2006 Elantra or Santa Fe typically requires access to a diagnostic scan tool that supports Hyundai’s immobilizer and body electronics modules. The technician connects to the OBD-II port, navigates to the keyless entry programming menu, and places the vehicle into learning mode. Once learning mode is active, each button on the fob is pressed in sequence so the body control module can store its rolling-code seed. Some model years within the 2000–2006 range support a manual on-board procedure that does not require a scan tool. In those cases, the ignition is cycled a specific number of times within a narrow time window, the driver door lock actuator cycles to confirm entry into program mode, and then a button press on the new remote completes the pairing. Automotive locksmiths familiar with early-2000s Hyundai platforms generally keep both methods in their workflow, falling back to scan-tool programming when the on-board sequence fails or is not supported by the specific model year.

Vehicle Compatibility: Elantra and Santa Fe (2000–2006)

The 2000–2006 Hyundai Elantra spans two generations — the XD body style introduced for 2001 in most markets and the tail end of the prior J2 platform for the 2000 model year. Both generations used the same 315 MHz remote entry system, making the fob a direct fit across the range. The Hyundai Santa Fe during this period covers the first-generation SM platform, which debuted as a 2001 model and ran through 2006 before the second-generation redesign. Because the Santa Fe shared its electrical architecture with other Hyundai products of the era, the remote hardware is interchangeable with Elantra units bearing the same FCC ID.

Vehicle owners sometimes confuse this keyless entry remote with a transponder key or a smart proximity fob. This unit is strictly a remote — it controls door locks and the panic alarm via RF signal but does not contain an integrated mechanical key blade or a proximity-based passive entry system. If the vehicle also requires a transponder-chipped ignition key, that is a separate component and must be programmed independently through the immobilizer system.

OEM vs. Aftermarket Replacement Options

Original-equipment remotes from Hyundai carry the exact FCC ID and internal electronics that the vehicle shipped with. Aftermarket alternatives are widely available and typically replicate the same 315 MHz transmitter circuit at a lower price point. When evaluating aftermarket units, locksmiths should verify that the replacement remote’s FCC certification matches one of the three approved IDs (OSLOKA-221T, OSLOKA-230T, or OSLOKA-240T) and that the rolling-code chip inside is compatible with Hyundai’s body control module protocol. Poorly sourced clones may transmit on the correct frequency but use an incompatible code-hopping algorithm, which results in the unit failing to pair even when the programming procedure is executed correctly.

Battery replacement is a routine maintenance item for the fob. The case snaps apart along a seam at the midpoint, revealing a coin-cell battery — typically a CR2032 or CR2025 depending on the specific PCB revision. Swapping the battery does not erase the stored rolling code, so reprogramming is not necessary after a simple battery change.

When to Contact a Locksmith

If the remote stops responding after a battery swap, the issue may lie in a corroded battery contact, a damaged transmitter coil, or a body control module that has dropped the stored code. A qualified automotive locksmith can diagnose whether the fault is in the remote itself or in the vehicle’s receiver module, reprogram the device if needed, and test the signal output with an RF frequency counter to confirm it is broadcasting at 315 MHz. For the 2000–2006 Elantra and Santa Fe, mobile locksmith service is a practical alternative to a dealer visit, often completed at the vehicle’s location in under thirty minutes.

Related help: Hyundai auto locksmith, car key replacement, car key programming.

Compatible and related keys: Hyundai Smart Key Fob (FCC ID SY5HMFNA04), compatible Hyundai 4-Button Remote Key Fob (FCC ID OSLOKA-310T), compatible Hyundai 4-Button Remote Key Fob (FCC ID OSLOKA-360T), Hyundai 4-Button Remote Key Fob (FCC ID OSLOKA-423T) (compatible fob), Hyundai 4-Button Remote Key Fob (FCC ID OSLOKA-950T), Hyundai/Kia OEM Smart Key Fob, Hyundai Remote Key Fob (FCC ID HA-T038) (compatible fob), Hyundai Smart Key Fob (compatible fob).