Fuel-it Flex Fuel Kit for S58 BMW G80 G82 G87 M2 M3 M4

If you're running E85 or ethanol mixes in your G80 M3 or G82 G83 M4, you need this kit!


Know your exact ethanol content in real-time via the Fuel-It! or JB4 app on your smartphone or tablet.
This complete flex fuel kit installs in under 30 minutes and reads your exact E85 mixture in the Fuel-It! smartphone app or JB4 app if equipped. Features CNC machined fittings for a quick plug and play installation with nylon sleeved stainless steel braided fuel lines for life long leak free operation.

The complete kit includes the following:

Genuine Continental ethanol sensor
Fuel-It! Bluetooth Universal Analyzer (view E85 mix via Fuel-It! app) OR CANflex ECA (no Fuel-It! app support without the Bluetooth ECA), view E85 mix via JB4 or flash logging)
Two stainless steel braided fuel lines with black nylon sheathing to protect your other engine bay components
Proprietary custom billet fittings for plug and play OEM integration
One wiring harness with Posi-tap connector
Bluetooth Model Supports stand-alone Bluetooth operation with the Fuel-It! app
Bluetooth (iPhone or Android app must be downloaded to use this feature)
If you are using an Apple product the app can be found by clicking here
If you are using an Android product the app can be found by clicking here

This kit is compatible with the following:

2021+ S58 G80 BMW M3
2021+ S58 G82 G83 BMW M4

2023+ S58 G87 BMW M2

*We have also made it optional to purchase all the items ala-cart should you choose but for the kit to work it must include the Fuel Lines, Ethanol Sensor, and Analyzer.

*For the BMW G-series JB4 Bluetooth version connect the white wire to position #4 on the JB4 25 pin harness. Select WMI page option 2/3/4 input to enable.

*For CANflex adapter JB4 & MHD use engine bay CANbus connections in our guide. BM3 requires connection to CANbus wires on BCM module under passenger side dash. E85 flex fuel sensor for S58 BMW


Fuel It FLEX FUEL sensor for S58 BMW M3 M4 G80 g82 g83 install location


Fuel It FLEX FUEL sensor KIT for S58 BMW M3 M4 G80 g82 g83 install location
Fuel-It! E85 Ethanol Content Tester

Install Video




Fuel-it! App Video