Cobb FA20DIT Flex Fuel Ethanol Sensor Kit and Optional Tuning

2015-2020 Subaru WRX

Ships for free in the 48 states

A complete plug and play solution enabling users to convert their supported Subaru WRX to a Flex Fuel configuration. This is the easiest to use and most sophisticated Flex Fuel kit on the market. Utilizing OEM fuel and electronic connectors, the Ethanol Sensor Kit measures the ethanol content of fuel being fed to the motor. That data is then converted into a signal that the ECU can use for adjusting calibrations and to be displayed on a custom Accessport monitor.

NOTE: Requires custom tuning. Protuning Required. We will contact you after purchase to gather details about your vehicle. Minimum requirements for custom tuning include upgraded fuel pump and electronic boost controller. Please see recommended products below.



  • Plug and Play installation
  • Uses OEM grade fuel and electrical connections
  • Case constructed out of Billet Aluminum
  • Retains Factory Compensations

Cobb Subaru WRX Flex Fuel Sensor Overview


The Cobb FA20DIT Flex Fuel Ethanol Sensor kit is a must if you are planning on running an E85 blend in your WRX. Stop letting gas stations and fuel mixture equations dictate your route and live your life. Gone are the days of map switching at the fuel pump, as Cobbs Flex Fuel sensor will do all the dirty work, and you will reap the benefits.

Cobb has put in the leg work and delivered a top-notch Flex Fuel sensor that will monitor the current ethanol content your engine is seeing, and will relay that info to the ECU. This allows changes to be made accordingly, and will keep your engine happy, while still seeing all the benefits from the higher Ethanol content. The most common benefit for drivers is the added power ethanol unleashes. Combine that with the knock resistance, cooler charge temps, and Flex Fuel is a no brainer.

Installing this kit requires a 300lph fuel pump, 3 port boost solenoid , and a custom Protune. Please reach out to your local Cobb Protuner for assistance with the custom tune.


This emblem can be affixed to your trunk or any other part of your vehicle. The logo features a half yellow, half World Rally Blue X. A nice custom touch for any Subaru Flex Fuel Kit owner.

  • 2015-2020 Subaru WRX
  • Use photos from current listings

SubiSpeed Installation Video

1 customer review

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(based on 1 review)
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  1. Easy power

    By @Subiesaenz February 16, 2018

    Even on a stock setup with the exception of a fuel pump, my buddies still make a decent amount of power. 322WHP... Currently i am running 350WHP and 368WTQ on a conservative tune. This is affordable power, especially for the FA20. Install was a breeze. Just as easy as installing the Accessport.

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