I have a simple answer to this issue. Why not take to vehicle to the dealer
or a reputable indy and get the system in question tested. Then decide what the
next course of action should be. If you don't have to money to fix it, save up then
get it done in the future. Either way arguing with others doesn't solve the problem
but getting it fixed will.

__________________
"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….