BMW X3 X4 - F & G Chassis Flex Fuel Ethanol Content Sensor for E85 Fuel Monitoring

Know your exact ethanol content in real-time with our new LED display or by using the BMS CANflex, Fuel-It! or JB4 mobile app on your smartphone or tablet.

This is a complete plug & play kit to install a flex fuel kit in your B58 equipped BMW X3 or X4 in about 30 minutes. (Check compatibility for your platform below)

Run E85 with confidence. The BMS CANflex kit gives your B58 equipped BMW X3 or X4 a clean, accurate way to read ethanol content and send that data directly to your tune.

This complete flex fuel kit, also known as an ethanol sensor kit, E85 sensor, flex fuel sensor, ethanol content sensor, fuel composition sensor, or flex fuel composition sensor, installs in about 30 minutes.

The CANflex ECA works as an ethanol content analyzer, E85 analyzer, and Bluetooth flex fuel analyzer in one compact system. It reads your fuel mixture using a genuine Continental® ethanol sensor and outputs the data through CANbus, Bluetooth, a built-in LED display, and 5v output for legacy support.

Our CANbus ECA is compatible with JB4 as well as flash only applications like MHD, BM3, and EcuTek that read the standard 0xEC flex fuel CANbus address format .

We now offer 3 types of kits:

1. Complete Kit with CANbus ECA and PnP Harness = Includes a plug and play harness compatible with stock ECU flashes, JB4, ECUteck, and MHD. *If you have a manual transmission or a BM3 tune, you must purchase the universal harness.
2. Complete Kit with CANbus ECA and Universal Harness = Includes universal harness that works for all applications including manual cars and those running a BM3 flex fuel tune.
3. Complete Kit with Fuel-It! Bluetooth ECA = Includes a bluetooth ECA for use with JB4 and the Fuel-It! app. *Does not include CANbus integration

The complete kit with the BMS CANbus ECA includes the following:

• Genuine Continental® ethanol sensor
  
• BMS CANflex LED ECA for use with JB4, MHD, & BM3
• Stainless steel braided fuel lines with black nylon sheathing to protect your other engine bay components
• Plug and play harness (optional)
• (1) Tube of Super Lube®
• BMW/Supra Accessory Harness for S58/B58 motors

Download the free BMS CANflex app here:

The complete kit with Fuel-It! Bluetooth ECA includes the following:

• Genuine Continental® ethanol sensor
  
• Stainless steel braided fuel lines with black nylon sheathing to protect your other engine bay components
• Our new custom fitting now makes adding port injection easier than ever. Simply remove the 1/8" NPT fitting and add one of our optional port injection lines.
• Fuel-It! Bluetooth analyzer (iPhone or Android app must be downloaded to use this kit)

Download the Fuel-It! app here:

Replacement fuel lines are also available separately.

Vehicle Fitment

• 2018+ G01 BMW X3 B46 / B48 / B58
• 2019+ G02 BMW X4 B46 / B48 / B58

*For the BMW G-series JB4 platform connect the white or blue 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.

*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.

BMS Universal CANbus E85 Analyzer Installation and review

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