{"product_id":"cobb-can-flex-fuel-upgrade-module-harness-bracket-ethanol-sensor-2018-2021-subaru-wrx-vslxee","title":"Cobb CAN Flex Fuel Upgrade (Module\/Harness\/Bracket\/Ethanol Sensor) - 2018-2021 Subaru WRX","description":"\u003ch4\u003e\u003cstrong\u003eUpgrade Kit — Add Flex Fuel to Your Existing Cobb Setup\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe Cobb CAN Flex Fuel Upgrade Kit for the Subaru Models adds flex fuel capability to an existing Stage 1+ package without buying a full new kit. The CAN ethanol sensor reads the fuel's ethanol content in real time and sends that data directly to the Accessport, which adjusts boost, fuel, and ignition timing automatically based on what's in the tank. Run 91 octane on a daily commute and switch to E85 at the track — the system adapts without a retune.\u003c\/p\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0737\/9029\/2257\/files\/344650_extra_06.jpg?v=1717611067\" alt=\"Cobb CAN Flex Fuel Upgrade (Module\/Harness\/Bracket\/Ethanol Sensor) - 2018-2021 Subaru WRX\" style=\"width:100%;max-width:100%;margin:20px 0;border-radius:4px;\"\u003e\n\n\u003ch4\u003e\u003cstrong\u003eHow the CAN System Works\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eTraditional flex fuel setups require the sensor signal to be wired into the ECU and require a custom tune for each ethanol blend. The Cobb CAN system is different — the ethanol sensor communicates through the same CAN bus the Accessport already monitors, and the Accessport firmware handles the tune adjustment automatically based on the sensor reading. The result is a truly seamless flex fuel experience where the car runs the optimal tune for whatever is in the tank at any given moment.\u003c\/p\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0737\/9029\/2257\/files\/344650_extra_08.jpg?v=1717611067\" alt=\"Cobb CAN Flex Fuel Upgrade (Module\/Harness\/Bracket\/Ethanol Sensor) - 2018-2021 Subaru WRX\" style=\"float:right;max-width:47%;margin:0 0 16px 16px;border-radius:4px;\"\u003e\n\n\u003ch4\u003e\u003cstrong\u003ePlug-In CAN Connection — No ECU Wiring Required\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe Cobb CAN Flex Fuel kit connects to the vehicle's existing CAN bus through a simple plug-in harness — no splicing into the ECU, no custom wiring. The Accessport V3 is required to use this kit, as it's the device that reads the CAN data and displays or acts on it. Installation is straightforward and reversible.\u003c\/p\u003e\n\n\u003cdiv style=\"clear:both\"\u003e\u003c\/div\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0737\/9029\/2257\/files\/344650_extra_03.jpg?v=1717611067\" alt=\"Cobb CAN Flex Fuel Upgrade (Module\/Harness\/Bracket\/Ethanol Sensor) - 2018-2021 Subaru WRX\" style=\"float:left;max-width:47%;margin:0 16px 16px 0;border-radius:4px;\"\u003e\n\n\u003ch4\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003ePlatform: Subaru Models\u003c\/li\u003e\n  \u003cli\u003ePlug-in CAN bus connection — no ECU wiring or splicing required\u003c\/li\u003e\n  \u003cli\u003eRequires Cobb Accessport V3 for sensor data display and tune adjustment\u003c\/li\u003e\n  \u003cli\u003eReal-time ethanol content detection — automatic tune adjustment via Accessport\u003c\/li\u003e\n  \u003cli\u003eUpgrade kit — adds flex fuel to existing Stage 1+ Cobb setup\u003c\/li\u003e\n  \u003cli\u003eFully reversible installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"clear:both\"\u003e\u003c\/div\u003e\n\n\u003ch4\u003e\u003cstrong\u003eFitment Notes\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003ePlatform: Subaru Models\u003c\/li\u003e\n  \u003cli\u003eRequires Cobb Accessport V3 — does not work without Accessport\u003c\/li\u003e\n  \u003cli\u003eConfirm MT vs CVT compatibility by SKU before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eStraight From Subispeed\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe Cobb CAN system is the right approach to flex fuel on the Subaru — plug-in installation, Accessport integration, and automatic tune adjustment without a separate fuel management system or wiring harness. If you are on a Cobb tune and considering E85, the CAN Flex Fuel kit is the cleanest way to do it.\u003c\/p\u003e\n\n\u003ch4\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCobb CAN Flex Fuel Kit — Subaru Models\u003c\/li\u003e\n  \u003cli\u003eCAN bus harness and sensor\u003c\/li\u003e\n  \u003cli\u003eAll mounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eAbout Cobb Tuning\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eCobb Tuning has been developing performance parts and tuning solutions for Subaru vehicles since 1999. Based in Austin, Texas, Cobb built their reputation on the Accessport — the most widely used Subaru ECU tuning device on the market — and expanded that into a full ecosystem of intake, exhaust, drivetrain, and engine bay accessories engineered specifically for the platforms they support. Every Cobb product is developed in-house and validated on their own test vehicles before it reaches customers. Subispeed carries the full Cobb catalog because their engineering standards and platform-specific development process consistently produce parts that work exactly as advertised.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2018-2021\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eWrx\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"COBB","offers":[{"title":"Default Title","offer_id":45712559439958,"sku":"COBB344650","price":310.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/0411\/1190\/files\/lvod072bemva_1ba2afc7-71b7-4b5b-94c3-869d14d9f892.jpg?v=1788782178","url":"https:\/\/truegearus.com\/products\/cobb-can-flex-fuel-upgrade-module-harness-bracket-ethanol-sensor-2018-2021-subaru-wrx-vslxee","provider":"TrueGear","version":"1.0","type":"link"}