Run E85 with confidence. The BMS CANflex kit gives your S58 BMW a clean, accurate way to read ethanol content and send that data directly to your tune.

This complete S63TU flex fuel kit (FFK), 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 with the optional plug & play harness.

The CANflex ECA works as an ethanol content analyzer (ECA), 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.

Perfect for S58 owners running E85, adding port injection, or wanting accurate real-time ethanol data for JB4, MHD, BM3, or EcuTek tuning.

Complete kit

• Genuine Continental® ethanol sensor 
  
• BMS CANflex LED ECA for use with JB4, MHD, EcuTek, and BM3
• Tube of Super Lube
• Billet custom fittings
• Stainless steel braided fuel lines with black nylon sheathing to protect your other engine bay components
  

   

  CANflex ECA's support all the popular CANbus addresses (0xec, 0x4cb, etc), including custom addressing.

Download the free BMS CANflex app

Wiring diagram for the new BMS Bluetooth CANflex Harness

Red: (originally Red/Green) 12v switched power via fuse tap or posi-tap
Black: Chassis ground
Brown: (originally Orange) CAN-
Green: (originally Red/Blue) CAN+
Blue: 5V legacy output for input into JB4

This kit is compatible with the following:

BMW M5
• 2012-2016 BMW M5 (F10)
• 2018-2023 BMW M5 (F90)
• 2025+ BMW M5 (G90/G99)

BMW M6
• 2012-2019 BMW M6 (F12/F13/F06)

BMW M8
• 2019-2025 BMW M8 (F91/F92/F93)

BMW X5M
• 2015-2018 BMW X5 M (F85)
• 2020+ BMW X5 M (F95)

BMW X6M
• 2015-2019 BMW X6 M (F86)
• 2020+ BMW X6 M (F96)

BMW 7 Series
• 2023+ BMW 760i xDrive (G70)

*For the BMW F and G-series 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.