For the 8Y S3, MK8 Golf R and MK8 GTI Clubsport running E85, stage 1 or fast road flex fuel setups - this is the sensor kit that actually talks to your tune.
FUEL-IT-BT-PRO Bluetooth ethanol analyser with 5V analogue output - works with JB4, Cobb AccessPORT, FlashPro, and most standalone ECUs
Continental ethanol sensor (same spec as OEM units on B-cycle EA888 Gen 4 engines) - no guesswork on E0-E85 accuracy
Stainless braided lines + billet AN-6 fittings - built for track day vibration and daily driver longevity
No splicing, no cutting - mounts inline on the low-pressure fuel feed (pre-pump loop not supported)
Also fits other EA888.4-based platforms where the fuel rail feed line is accessible: TCR-spec Cup cars, privateer MK8 track builds, fast-road 8Y conversions
Search terms this answers: EA888 flex fuel sensor, MK8 E85 kit, 8Y ethanol monitor, stage 2 flex fuel, fast road E85, track day ethanol sensor, Bluetooth fuel analyser EA888.
