Hi my trucks front park assist has coded b1290-12 its the #3 sensor short to battery. does anyone know which sensor is the #3 sensor on the front bumper.

 

According to the factory fiche all 6 front sensors have the same number.I would make an educated guess that it is either of the center ones.You could swap one of those and see if the fault moves to #2 or #4 and then you'll know exactly which one is which.Usually the numbering sceme will be left to right as viewed from the driver's seat.