Audi RS3 8V/8Y & TT RS 8S 2.5T Flex Fuel Ethanol Content Sensor for E85 Monitoring

Stop Guessing. Start Knowing Your Exact Ethanol Content.

Running E85 on your turbocharged 2.5L Audi? Ethanol content at the E85 pump can vary from E50 to E85 or higher depending on season and station. Regular premium gas can have up to 10% ethanol at some stations. No more calculating gallons at the pump and guessing ethanol percentage. Just open the app and know.

Key Features

• Real-time ethanol content monitoring via Bluetooth
• Displays exact ethanol percentage (E-content) in the Fuel-It! or JB4 app
• 0–5V analog output for JB4 or flash tuning integration
• Genuine Continental ethanol sensor for OEM-grade accuracy
• Plug and play fuel line integration
• Ethanol safe PTFE fuel lines and fittings
• Installs in approximately 30 minutes
• No cutting or permanent modification required

Why You Need an Ethanol Sensor

E85 pumps rarely dispense true E85. Seasonal blends can drop into the E50 range without notice. If you’re tuning for ethanol, this matters.

With this kit you can

• Dial in your exact E85 blend every fill-up
• Avoid running too much ethanol on a pump gas map
• Maximize timing and boost safely on ethanol maps
• Maintain consistent performance at the track
• Protect your engine from unknown fuel mixtures

The Bottom Line

If you’re running E85, a flex fuel sensor isn’t optional, it’s essential.

Power, consistency, and safety all start with knowing exactly what’s in your tank.

Download the Fuel-It! ECA app here:

Vehicle Fitment

Audi TT RS
• 2018-2023 2.5L TFSI EVO 8S Audi TT RS, including Coupe and Roadster models

Audi RS3
• 2017-2020 2.5L TFSI EVO 8V Audi RS3, including Sedan and Sportback models
• 2022+ 2.5L TFSI EVO 8Y Audi RS3, including Sedan and Sportback models

Note: European versions of the RS3 8Y and TTRS platforms are not compatible without modifications and re-using your stock connector in place of the supplied elbow connection.

*For the Audi JB4 platform connect the white wire to position #16 on the JB4 25 pin harness. Select WMI Ethanol Setup option 1 to enable pin location 15/16 flex fuel input.

*Link to larger images of install pictures. Click here

Vehicle fitment