{"product_id":"mechanmagic-smart-key-fob-remote-for-nissan-sentra-versa-2013-2019-4-button-cwtwb1u840-46-chip-315mhz","title":"MechanMagic Smart Key Fob Remote for Nissan Sentra \u0026 Versa 2013–2019 — 4-Button CWTWB1U840, 46 Chip, 315MHz","description":"\u003cp\u003e\u003cstrong\u003eMechanMagic Smart Key Fob Replacement (CWTWB1U840) is a ready-to-program 4-button keyless entry remote designed to replace the original Nissan Sentra and Versa push-start remotes from 2013–2019.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your factory remote is lost, damaged, or the buttons stopped working, this MechanMagic replacement offers a cost-effective way to restore remote locking, trunk release, and push-start convenience without buying a full OEM unit. The fob ships brand-new with battery and tested electronics; it requires a qualified locksmith or dealership to cut and program the transponder before use. Double-check the FCC ID on your current remote—this unit matches CWTWB1U840 (not CWTWB1U815) and operates at 315 MHz with a 46 chip.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I confirm this fob fits my Nissan Sentra or Versa?\u003c\/h3\u003e\n\u003cp\u003eCompatibility hinges on the FCC ID and the physical button layout. Inspect your existing remote for FCC ID CWTWB1U840 and verify it’s a 4-button push-start style; if those match, this MechanMagic fob is engineered as a direct replacement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck the original remote’s FCC ID: must be CWTWB1U840.\u003c\/li\u003e\n  \u003cli\u003eConfirm your vehicle is a 2013–2019 Nissan Sentra or Versa.\u003c\/li\u003e\n  \u003cli\u003eEnsure your vehicle uses a push-start (smart key) system.\u003c\/li\u003e\n  \u003cli\u003eUse the vehicle fitment tool or product images to compare button layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat steps are required to get the remote working with my car?\u003c\/h3\u003e\n\u003cp\u003eThis MechanMagic fob arrives pre-tested and with a battery, but it won’t function until the blade is cut and the transponder is professionally programmed. A locksmith or dealership can perform cutting and programming; they will sync the fob to your car’s immobilizer system so the push-start and remote functions operate normally.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHave a qualified locksmith or dealer cut the emergency key blade.\u003c\/li\u003e\n  \u003cli\u003eAsk the technician to program the 46 chip via dealer-level or locksmith tools.\u003c\/li\u003e\n  \u003cli\u003eTest lock\/unlock, trunk, and push-start recognition after programming.\u003c\/li\u003e\n  \u003cli\u003eRetain your original fob until the replacement is confirmed to work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key technical details and quality assurances?\u003c\/h3\u003e\n\u003cp\u003eThe MechanMagic remote complies with the specified RF and chip standards used by Nissan for the listed years. Each unit ships new, without manufacturer logos, and passes bench testing before leaving our facility to ensure consistent electronic performance upon programming.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFCC ID: CWTWB1U840; IC ID: 1788D-FWB11U840.\u003c\/li\u003e\n  \u003cli\u003eOperating frequency: 315 MHz; transponder chip: 46.\u003c\/li\u003e\n  \u003cli\u003ePart numbers matched: 285E3-3SG0D \/ 285E33SG0D.\u003c\/li\u003e\n  \u003cli\u003eIncludes internal battery; fully bench-tested before shipping.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there any limitations or things to watch for?\u003c\/h3\u003e\n\u003cp\u003eThis specific replacement only suits the CWTWB1U840 variant; it will not work if your existing key is model CWTWB1U815. Also, because programming involves vehicle immobilizer pairing, DIY programming is not recommended—professional tools are required to avoid lockouts or non-recognition.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNot compatible with CWTWB1U815 remotes—match FCC ID carefully.\u003c\/li\u003e\n  \u003cli\u003eProgramming must be completed by a qualified locksmith or dealer.\u003c\/li\u003e\n  \u003cli\u003eDesigned for push-start vehicles only (smart key systems).\u003c\/li\u003e\n  \u003cli\u003eProduct ships with no manufacturer logo for aftermarket use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: Drivers of Nissan Sentra and Versa model years 2013–2019 who need an affordable, high-quality replacement for a lost or failing smart key fob. Ideal for owners who have confirmed their original remote’s FCC ID is CWTWB1U840, those who prefer a third-party replacement over an OEM-priced unit, and anyone planning to use a locksmith or dealer for cutting and programming. If you want a new, tested remote ready for professional programming that matches Nissan’s 315 MHz \/ 46-chip specification, this MechanMagic fob is built to meet that need.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this replace my Nissan remote if it says a different FCC ID?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. This fob matches FCC ID CWTWB1U840 only. If your remote shows CWTWB1U815, this unit will not work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I program the key myself at home?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Programming requires dealer or locksmith tools. Have a qualified professional cut and program the transponder for proper operation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"MechanMagic","offers":[{"title":"Default Title","offer_id":48084975583390,"sku":"B0DRF878GH","price":40.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/mechanmagic-smart-keyfob-front.jpg?v=1785866239","url":"https:\/\/northtrailauto.ca\/products\/mechanmagic-smart-key-fob-remote-for-nissan-sentra-versa-2013-2019-4-button-cwtwb1u840-46-chip-315mhz","provider":"North Trail Auto","version":"1.0","type":"link"}