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.

If you're running E85 or ethanol mixes in your BMW Z4, you need this kit!

This is a complete plug & play kit to install a Bluetooth ethanol sensor in your 2020+ G29 BMW Z4 in about 30 minutes.

(Check compatibility for your platform below)

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:

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.
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.
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
Two stainless steel braided fuel lines with black nylon sheathing to protect your other engine bay components
LPFP pressure sensor
Plug and play harness (optional)
BMW/Supra Accessory Harness for S58/B58 motors
Download the free BMS CANflex apps here:
- If you are using an Android product the app can be found by clicking here.
- If you are using an Apple product the app can be found by clicking here.

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

Genuine Continental® ethanol sensor
Two stainless steel braided fuel lines with black nylon sheathing to protect your other engine bay components
Fuel-It! Bluetooth analyzer (iPhone or Android app must be downloaded to use this kit)
Plug and play harness
Includes both Bluetooth App & 5v analog output for JB4 or flash tuning
- 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

*Replacement fuel lines are also available separately.

Vehicle Fitment

2020+ G29 BMW Z4 B48 30i and B58 M40i

*Manual transmission or BM3 require universal harness. All others
can use PNP harness.

*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 Supra JB4 platform connect the white wire to position #4 on the JB4 25 pin harness. Select the WMI setup page and enable bit 0.

*Free shipping in USA on complete kits only.

*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 info@fuel-it.com

Install Videos