Honda OEM Remote Key Fob – E4EG8D444HA for Acura CL, RL & RSX

Fitments for the Honda OEM Remote Key Fob – E4EG8D444HA for Acura CL, RL & RS include the Acura CL (2000–2003), Acura RL (1996–2004), and Acura RSX (2005–2006). Across these three Acura platforms, the unit pairs transponder immobilizer authentication with remote keyless entry on a 315 MHz carrier frequency. Each Honda OEM Remote Key Fob carries an E4EG8D444HA transponder identifier, which the vehicle’s immobilizer module must recognize before the engine will crank. Owners replacing the fob should expect a programming procedure that registers both the transponder and the RF remote functions. When ordering a Honda OEM Remote Key Fob, confirm the E4EG8D444HA chip designation to ensure full compatibility with the target vehicle.

Honda OEM Remote Key Fob — Transponder and RF Details

The E4EG8D444HA transponder embedded in this remote is integral to Honda key & lock service‘s immobilizer security layer used throughout the late-1990s and early-2000s Acura lineup. During each start attempt, the vehicle’s antenna ring energizes the transponder coil inside the key head, prompting a coded challenge-response exchange. If the returned code does not match values stored in the immobilizer ECU, fuel delivery and ignition are inhibited. This anti-theft mechanism is entirely separate from the RF remote lock and unlock function, which operates at 315 MHz — a frequency standard across most North American Honda and Acura models of this era.

Because the device combines both transponder and remote capabilities in a single housing, programming involves two distinct registration steps. The transponder must be written into the vehicle’s immobilizer memory, while the remote portion must be paired to the body control receiver. Many automotive locksmiths handle both steps in a single service call using diagnostic tools that communicate with the vehicle’s OBD-II port.

Acura Vehicle Compatibility

The three validated fitments span a roughly ten-year production window, which is consistent with Honda’s practice of sharing immobilizer platforms across its Acura brand during this period.

Acura CL (2000–2003)

The second-generation Acura CL coupe used Honda’s immobilizer system tied to the E4EG8D444HA transponder. Both the base and Type-S trims from this production run accept the fob, as the immobilizer hardware did not change between trim levels. Replacement involves cloning or registering the transponder through the vehicle’s immobilizer ECU, followed by remote pairing.

Acura RL (1996–2004)

Spanning the first and second generations, the Acura RL’s fitment window is the longest among the three models. The 1996–2004 range covers the transition from the 3.5 RL to the refreshed models, all of which relied on the same immobilizer architecture. Locksmiths working on earlier RL units (1996–1998) should verify that the vehicle’s immobilizer module accepts the E4EG8D444HA code, as some very early production vehicles had different transponder requirements.

Acura RSX (2005–2006)

The Acura RSX’s final two model years — 2005 and 2006 — are the validated fitments. These later-production RSX vehicles share the transponder protocol with the CL and RL despite the RSX sitting on a different chassis platform. The remote portion of this key fob provides standard lock, unlock, and trunk release functions on the RSX.

Programming Considerations for Locksmiths

Registering the Honda OEM Remote Key Fob on any of the three Acura models typically requires an advanced diagnostic tool capable of accessing Honda’s immobilizer subsystem through the OBD-II connector. The procedure generally involves entering a security access mode, adding the new transponder’s E4EG8D444HA identifier to the ECU’s key memory, and then completing a remote pairing routine. Some tools combine these steps into a single workflow, while others require the technician to handle immobilizer registration and remote programming separately.

For the remote pairing step, certain Acura models from this era also support a manual on-board programming sequence — cycling the ignition and pressing lock within a timed window. However, the transponder registration almost always demands a diagnostic interface; there is no reliable manual bypass for the immobilizer side of the procedure.

When multiple keys are being registered, all existing and new transponders must typically be programmed in a single session, as writing a new key set may erase previously stored transponder codes. Locksmiths should inform vehicle owners of this requirement before beginning work.

OEM vs. Aftermarket Considerations

As an OEM-grade product, this remote carries the original Honda transponder configuration, which means the E4EG8D444HA chip should be pre-coded or ready for direct registration without the cloning workarounds sometimes needed with aftermarket blanks. Aftermarket alternatives exist for these Acura models, but they vary in chip quality and RF module reliability. Technicians who regularly service Honda and Acura vehicles often prefer OEM remotes for the predictability they bring to the programming workflow — fewer failed handshakes, fewer repeat service calls.

Vehicle owners weighing cost against reliability should understand that a failed aftermarket transponder can result in a second service visit and additional labor charges, which may offset the initial savings. Consulting with an experienced automotive locksmith before purchasing a replacement remote helps avoid compatibility issues.

When to Contact a Professional Locksmith

Because the Honda OEM Remote Key Fob requires immobilizer registration that is not achievable through simple on-board steps, professional locksmith assistance is the most practical path for most vehicle owners. A qualified automotive locksmith will verify the transponder type, confirm fitment against the vehicle’s VIN, program the immobilizer, pair the remote, and cut the mechanical blade — all in one appointment. Mobile locksmith services can typically perform the entire process at the vehicle’s location, eliminating the need for a dealership visit or tow.