KeylessOption Nissan Key Fob Replacement KR5TXN4 — 5-Button 1‑Pack for Altima/Versa/Sentra (2019–2023), Battery Included

This KeylessOption key fob is a complete 5-button replacement compatible with Nissan Altima, Versa, and Sentra (2019–2023) using OEM code KR5TXN4 and requires dealer or locksmith programming.

If you lost or damaged your factory remote, this aftermarket KeylessOption unit provides the same button layout and built-in electronics, including a battery, so it’s ready for programming as soon as the metal key blade is cut to match your car. It’s sold as a single-pack and matches the OEM frequency and signal format, but note that professional programming is necessary to sync the fob with your vehicle’s immobilizer and keyless entry system.

Will this fob work with my Nissan model and year?

This fob is designed for Nissan Altima, Versa, and Sentra models from 2019 through 2023 that originally use the KR5TXN4 remote. It follows the OEM electrical specifications and button layout to ensure compatibility with the vehicle’s keyless entry functions. Always verify your existing remote’s part number before purchase.

• Compatible models: Altima, Versa, Sentra (2019, 2020, 2021, 2022, 2023)
• OEM reference: KR5TXN4 frequency and signal format
• Check original fob part number to confirm match

What comes in the box and what needs to be done before programming?

The package contains a fully assembled KeylessOption key fob with built-in electronics and a pre-installed battery. The metal key insert is uncut; you must have the blade cut to match your car’s ignition/door locks before a dealer or locksmith can program the remote. No additional internal components are required.

• Included: complete fob, electronics, and battery
• Not included: cut key blade — have a locksmith or dealer cut it
• After cutting, professional programming at dealer or locksmith required

How is programming handled and why is a dealer or locksmith required?

Modern Nissan remotes pair with vehicle immobilizer systems and often require secure access to the car’s computer to register the new transmitter. Dealers and certified locksmiths have the diagnostic tools and security credentials to add a new key fob without affecting existing keys. Attempting DIY programming without the proper tools may not work and could lock the vehicle’s system.

• Programming must be performed by dealer or locksmith
• They use OEM scan tools to register the KR5TXN4 transmitter ID
• Professional service preserves existing keys and security features

What should I expect for fit, function, and long-term use?

This aftermarket remote mirrors the original fob’s button positions and provides standard keyless entry functions like lock, unlock, trunk release, panic, and remote start where supported. Because the electronics match OEM signaling, you’ll retain normal range and responsiveness once programmed. Keep a spare battery on hand and protect the fob from prolonged moisture or impact to extend its lifespan.

• Buttons included: lock, unlock, trunk, panic, remote start (5-button layout)
• Battery pre-installed; replace as needed with standard CR-type battery
• Aftermarket housing built for OEM-like fit and durability

Who is this for: Drivers of 2019–2023 Nissan Altima, Versa, or Sentra who need a direct-fit replacement remote (OEM KR5TXN4) and are prepared to have a dealer or locksmith cut the key blade and program the unit. It’s ideal if you want a complete, ready-to-program remote with electronics and battery included, sold as a single pack for quick replacement.