Continental Automotive Smart Key Fob KR5TXN7 – Nissan & Infiniti

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

Operating at 433.92 MHz with an NSN14 emergency key blade profile, the Continental Automotive Smart Key Fob (FCC ID KR5TXN7) provides keyless entry and push-to-start functionality for a range of Nissan and Infiniti vehicles manufactured between 2019 and 2024. This unit is registered under FCC ID KR5TXN7, confirming its RF compliance for the US market and tying it to Continental Automotive — a Tier 1 OEM supplier better known in the broader automotive world as Continental AG. The fob houses an integrated emergency insert key cut to the NSN14 keyway, giving drivers mechanical access to the door lock when battery power is depleted. A correctly enrolled Continental Automotive Smart Key Fob (FCC ID KR5TXN7) will communicate wirelessly with the vehicle’s body control module, authenticating the driver’s presence and enabling ignition without a traditional key turn. Because this smart key covers multiple model lines across two brands, it is one of the more versatile Continental-manufactured proximity remotes currently deployed in the Nissan–Infiniti platform family.

Continental Automotive Smart Key Fob (FCC ID KR5TXN7) Vehicle Compatibility

The following fitment list represents validated applications for this proximity remote. Each vehicle listed below uses the 433.92 MHz frequency band and accepts the NSN14 mechanical blade for emergency entry:

• Infiniti QX50 / QX55 — 2019 model year
• Nissan Frontier — 2020–2021 and 2022 model years
• Nissan Maxima — 2019–2023 model years
• Nissan Murano — 2019–2024 model years
• Nissan Pathfinder — 2019–2021 model years
• Nissan Titan — 2019–2024 model years

It is worth noting that the Nissan Frontier appears in two distinct generation brackets — 2020–2021 (outgoing platform) and 2022 (redesigned platform). Both generations accept the KR5TXN7 fob, but locksmiths should verify that the blank is cut to the correct bitting for the specific VIN, as door lock cylinder changes between generations can affect the emergency blade’s mechanical fit even though the electronic pairing is consistent across both.

NSN14 Emergency Blade and Mechanical Access

The NSN14 keyway is a high-security profile used across many modern Nissan and Infiniti models. The insert key rides in a slot along the spine of the fob and is released via a small slide latch. When a locksmith cuts a replacement blade, precise depth and spacing specifications matter — the NSN14 profile uses a relatively narrow channel that does not tolerate sloppy tolerances. Standard automotive key machines equipped with a Nissan jaw set handle this cut, but laser/track-style cutting stations tend to produce a more consistent result on the NSN14 blank.

For vehicle owners, the emergency blade serves a single purpose: gaining mechanical entry to the driver’s door when the fob’s battery dies or when proximity detection fails due to signal interference. It does not start the engine. Once inside the cabin, placing the dead fob against the steering column’s push-to-start button and pressing will typically allow the vehicle’s low-frequency antenna to detect the passive transponder inside the remote at close range, enabling a backup ignition cycle.

Programming and Enrollment Procedures

Registering this smart key to a vehicle requires diagnostic communication with the body control module (BCM) through the OBD-II port. Unlike older Nissan models that accepted on-board key learning sequences with only existing working keys, the vehicles covered by this fob generally require a scan tool or dedicated key-programming device capable of handshaking with the BCM’s immobilizer subsystem. Automotive locksmiths typically use tools from Autel, XTOOL, SmartPro, or the Nissan CONSULT III+ dealer diagnostic platform to perform the registration.

The general procedure involves the following steps:

1. Connect the diagnostic tool to the vehicle’s OBD-II port.
2. Access the immobilizer or intelligent key module.
3. Select the appropriate model and year from the tool’s vehicle menu.
4. Initiate the key registration routine — the tool will instruct the BCM to enter learning mode.
5. When prompted, place the new fob inside the vehicle (usually on the dash or in the center console tray near the key slot antenna).
6. Confirm registration — the tool will report whether the BCM has accepted the new smart key’s ID.
7. Test all functions: lock, unlock, trunk release, remote start (if applicable), and push-to-start ignition.

If multiple fobs are being enrolled, all units — including previously working ones — should be registered during the same session. The BCM in most Nissan and Infiniti vehicles overwrites its stored key list during the learning process, which means any fob not present during the procedure will be deregistered.

Frequency and Signal Characteristics

The 433.92 MHz operating frequency places this fob in the UHF band commonly used by proximity remotes in markets outside North America as well, though many Nissan models sold in the US have migrated to 433.92 MHz from the older 315 MHz standard over recent model years. Locksmiths sourcing aftermarket replacements must confirm the frequency matches — installing a 315 MHz unit on a 433.92 MHz vehicle will result in zero RF communication, even if the physical shell and blade are identical.

Signal range varies by environment but generally falls between 30 and 50 feet for remote lock and unlock commands under open-air conditions. Proximity detection for push-to-start operates at much shorter range, typically within three feet of the vehicle’s external door handles and interior cabin antennas. Weak battery voltage reduces both ranges significantly before complete failure occurs.

OEM vs. Aftermarket Considerations

As the original manufacturer, Continental Automotive produces the OEM version of this fob for Nissan and Infiniti. Aftermarket alternatives exist from third-party suppliers and typically replicate the FCC ID KR5TXN7 housing, circuit board layout, and frequency. The key distinction between OEM and aftermarket units often comes down to component quality — specifically the RF oscillator’s frequency stability and the battery contact plating. OEM units from Continental tend to hold tighter frequency tolerances over a wider temperature range, which can matter in extreme climates where marginal aftermarket oscillators may drift enough to cause intermittent communication failures.

Vehicle owners seeking a replacement should be aware that both OEM and quality aftermarket versions of the fob require the same professional programming procedure. There is no plug-and-play self-pairing for this smart key — a locksmith or dealer visit is necessary regardless of the unit’s origin.

Battery Replacement

The fob uses a standard CR2032 coin cell battery, which is user-replaceable without tools in most cases. A small notch or seam along the fob’s edge allows the two halves of the shell to be separated with a flat-head screwdriver or coin. After swapping the battery, the fob does not need to be reprogrammed — the immobilizer pairing is stored in non-volatile memory on the circuit board and persists through power loss. However, if the battery has been dead for an extended period, the vehicle’s BCM may require a brief reacquaintance cycle: locking and unlocking the doors with the remote a few times typically resyncs the rolling code counter.

Related help: Infiniti auto locksmith, Nissan auto locksmith, car key replacement, car key programming.

Compatible and related keys: compatible Aftermarket Smart Key Fob, Aftermarket Transponder Key, compatible Nissan/Infiniti OEM Remote Key Fob, compatible Lear Smart Key Fob (FCC ID CWTWBU735), related key: Nissan Transponder Key, compatible Lear Smart Key Fob (FCC ID CWTWB1U8), Nissan 3-Button Remote Head Key, Nissan Smart Key Fob.