Error "F1 Sensor" -- Which Sensor is This?

[Holla]

You should have labled the sensors as you installed them

Easiest way is do you have the parking sensors enabled as to when you pull close to something it will beep, then disconnect F2/3 then you go put your hand in front of them and see which one beeps for you, that will be yout F1 sensor---this function should still be working

Also make sure when you hook them all back up the your CENTER head is hooked into the F2 port--this is a must