Cobb Tuning Subaru CAN Flex Fuel Upgrade - 2018-2021 Subaru WRX

Add true flex fuel capability to your 2018–2021 Subaru WRX with the COBB CAN Flex Fuel Upgrade. This kit is designed to measure ethanol content in real time and feed that data into the vehicle’s CAN system so the ECU can use it for COBB Off The Shelf (OTS) maps or a custom calibration. The result is a clean, modern flex fuel solution that integrates like it belongs there.

At the center of the system is the COBB CAN Gateway, a billet aluminum module that injects aftermarket sensor data into your car’s CAN network for ECU use. Pair it with the included ethanol sensor kit and vehicle-specific harness for a straightforward install designed around the 2018–2021 WRX platform.

Flex Fuel Overview

Key Features

• CAN-Based Flex Fuel Integration: Measures ethanol content and communicates it through the CAN system for ECU use.
• Supports OTS or Custom Tuning: Designed to be utilized in COBB OTS maps or custom calibrations that support flex fuel.
• COBB CAN Gateway Included: Billet aluminum housing with precision PCB and a bolt-in bracket on supported cars.
• Complete Ethanol Sensor Kit: Includes ethanol sensor, mounting bracket, fuel lines with quick-connect fittings, and wiring.
• Vehicle-Specific Harness: Built specifically for 2018–2021 WRX fitment.

What’s Included

• COBB CAN Gateway (billet aluminum housing)
• Machined mounting bracket for bolt-in installation (supported vehicles)
• Vehicle-specific wiring harness (2018–2021 WRX)
• CAN Ethanol Sensor Kit:
  • Ethanol sensor
  • Sensor mounting bracket
  • Fuel lines with quick-connect fittings
  • Wiring harness to connect sensor to CAN Gateway

Emissions

This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results) via SEMA Garage Emissions Certification that verifies this product allows the vehicle to operate within legal emissions standards and is legal for on-street use in states that accept the Clean Air Act and EPA Anti-Tampering provisions.

NOT LEGAL FOR SALE OR USE IN CALIFORNIA on any emission-controlled motor vehicle.

Testing with the California Air Resources Board (CARB) to achieve 50-state compliance is pending. Once testing is complete and an EO number is issued, this product will be updated to 50-state legal status.

Product Highlight

Installation Notes

• Designed for a clean integration using the included vehicle-specific harness.
• Requires a flex-fuel compatible calibration (COBB OTS map support or custom tune) to utilize ethanol content data.
• Verify your WRX model year before purchase to ensure correct harness compatibility.

Compatibility & Disclaimers

Part number SC-COB01-0106. For 2018–2021 WRX only. Not compatible with 2015–2017 WRX due to different harness requirements. Emissions legality varies by state and configuration—always follow COBB’s application guide and verify local regulations.