[Dim718]

Hey guys need some help im running jb4 on my 2021 m850 gran coupe i have the blue tooth connector only gauge that works is the one that shows psi none of the other gauges work anyone have that issue

[Mike_L]

Are you plugged into the OBD2 port? Without it, there’s no data to show.

[phaser]

Originally Posted by Dim718

Hey guys need some help im running jb4 on my 2021 m850 gran coupe i have the blue tooth connector only gauge that works is the one that shows psi none of the other gauges work anyone have that issue

Please give us a brief review of your experience with the JB4, power increase, low end, top end, etc. Thanks in advance.