Keyecu Smart Proximity Remote Key for Nissan Sentra Versa Leaf (2013–2018) 4-Button – FCC CWTWB1U840, Unprogrammed

Keyecu Smart Proximity Remote Key (4-button) is a direct-fit replacement fob programmed by a locksmith to restore keyless entry and push-start proximity for compatible 2013–2018 Nissan Sentra, Versa and Leaf models.

When an OEM smart key is lost, damaged or stops working, this aftermarket Keyecu remote mirrors the original FCC ID CWTWB1U840 and IC 1788D-FWB1U840 to ensure physical and electrical compatibility. It ships unprogrammed and requires professional reprogramming with an automotive key programmer or locksmith. The shell, button layout and RFID transponder location match factory units so it can be registered to your vehicle exactly like the original key.

How do I confirm this fob fits my Nissan?

Match the part identifiers and the visual design of your existing key. Check both the FCC ID printed on your current fob and the button arrangement before ordering to avoid fitment issues.

• Replace FCCID: CWTWB1U840, IC: 1788D-FWB1U840
• Compatible models: Sentra, Versa, Leaf from 2013–2018
• Compare physical shape, 4-button layout and key blade profile
• Ensure your car originally used a proximity smart key (not simple remote)

What do I need to program this Keyecu remote?

The remote is sold unprogrammed and must be registered to your vehicle using professional equipment. Most independent locksmiths and dealer service centers can complete the procedure if they have the right tools.

• Recommended programmers: X100 PAD2, Londor K518, X300 DP, SKP900
• Contact locksmiths beforehand to confirm they will program this model
• Programming typically requires proof of vehicle ownership
• No user-facing manual reprogramming method is available

Will this remote restore all key functions?

Once professionally programmed, the Keyecu remote supports standard proximity, remote lock/unlock and panic functions if those features match your vehicle’s factory key. Any vehicle-specific immobilizer programming must be handled during the reprogramming session.

• Supports lock, unlock, trunk/panic and proximity start when programmed
• Physical key blade included for manual unlocking if equipped
• Transponder chip requires proper vehicle registration to start the car
• Function set mirrors factory fob after successful programming

This Keyecu fob is manufactured as an aftermarket replacement to match the original Nissan smart key’s appearance and electronics. It is not pre-linked to any vehicle; installation requires a qualified locksmith or dealership programming service. Always verify FCC/IC numbers and visual details against your current key before purchase to ensure a correct match.

Who this is for: vehicle owners of Nissan Sentra, Versa or Leaf model years 2013 through 2018 who need a cost-effective, appearance-accurate replacement smart key and are able to arrange professional reprogramming. It’s ideal for drivers replacing a lost or damaged factory fob who want a direct-fit aftermarket shell compatible with standard programming tools.