BMW X3M & X4M Bluetooth Flex Fuel Kit for the F9X S58

  • $479.95
Shipping calculated at checkout.


If you're running E85 or ethanol mixes in your S58 BMW X3M or X4M, 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 is a complete plug and play kit to install a Bluetooth ethanol sensor in your X3M or X4M in about 30 minutes.

(Check compatibility for your platform below)

The kit includes the following:

  • New 5/16" E85 compatible fuel lines for your engine bay
  • 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)
  • Plug and play harness
  • Includes both Bluetooth App & 5v analog output for JB4 or flash tuning

Replacement fuel lines are also available ala-cart.

This kit is compatible with the following

  • 2020+ S58 BMW X3M / X3M Competition
  • 2020+ S58 BMW X4M / X4M Competition

What's included

  • Fuel-It! bluetooth analyzer
  • Continental® ethanol sensor 13577429
  • Custom wiring harness (3AH-3C-B)
  • Fuel-It! bluetooth analyzer
  • Custom BMS steel braided hose (BMW-FFK-F02-L1)
  • Custom BMS steel braided hose (BMW-FFK-F02-L2)
  • Superlube® tube
  • RED Posi-Tap®

     *For the BMW S58 JB4 platform connect the white wire to position #4 on the JB4 25 pin harness.  Select WMI Ethanol Setup option 0 to enable pin location 2/3/4 flex fuel input.

     *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 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 or at the DME. 

    *If you aren't sure whether this kit fits your car, send us a picture of your engine bay with the engine cover removed to

    *Ethanol Sensors don't actually read the ethanol content, the readings are based on the absence of gasoline, so if your fuel is contaminated your ethanol readings may be artificially elevated.

     Fuel-It! E85 Ethanol Content Tester


    Click here if you are installing the CANFlex ECA in addition to your flex-fuel kit.