Keyecu Nissan 4‑Button Smart Proximity Remote Key Fob — FCC CWTWB1U840, Unprogrammed for 2013–2018 Sentra/Versa/Leaf

Keyecu’s Smart Proximity 4-button remote is a direct-replacement key fob designed to match the Nissan Sentra, Versa and Leaf models from 2013–2018 that use FCC ID CWTWB1U840.

If your factory key fob is lost, damaged, or the buttons no longer respond, this Keyecu remote provides the same physical fit and button layout as the original so a certified locksmith can program it to your vehicle. It ships unprogrammed and includes the correct FCC and IC identifiers so professionals can register it to your car’s immobilizer system.

Will this remote physically fit my Nissan model?

Yes — the Keyecu remote is molded to the same dimensions and button positions as the OEM fob for the listed Nissan years and models. Visual and part-number matching are essential to ensure mechanical compatibility before purchase.

• Replace FCC ID: CWTWB1U840, IC: 1788D-FWB1U840
• Compatible with Nissan Versa 2013–2017, Sentra 2013–2017, Leaf 2013–2017
• Confirm by matching your original key’s profile and FCC/part number

How do I get the remote programmed to my car?

The Keyecu unit arrives unprogrammed and must be professionally programmed by a qualified locksmith or dealer. There is no user-accessible programming method — a specialized key programmer or locksmith tools are required.

• Take the remote and your vehicle to a locksmith or dealer
• Recommended programming tools: X100 PAD2, Londor K518, X300 DP, SKP900
• Confirm the locksmith can program CWTWB1U840 keyed remotes before purchase

What components and features are included with this fob?

The Keyecu remote provides the shell, buttons, and internal board matching the OEM layout; it does not include pre-programming or vehicle-specific immobilizer codes. Battery and final testing are the responsibility of the installer.

• Factory-style 4-button layout for lock/unlock/trunk/panic
• Internal electronics compatible with CWTWB1U840 identification
• Ships unprogrammed — intended for locksmith programming

What should I check before ordering?

Before buying, verify your current key’s FCC ID and compare the housing visually to ensure a direct replacement. Also confirm local locksmiths can program this FCC ID so you won’t be left with an unusable fob.

• Match the FCC ID on your original key to CWTWB1U840
• Compare button shape and key housing to photos or the original fob
• Call locksmiths to confirm they will program this specific remote

Who is this for: Drivers of Nissan Sentra, Versa or Leaf model years 2013–2018 who need a like-for-like replacement key fob shell/electronics (FCC: CWTWB1U840) and are prepared to have a certified locksmith program the unit. This product suits owners wanting OEM-style fit and functionality without dealer markup, provided they arrange professional programming.