My 2006 Mercedes Benz E350 has a problem, while driving or at any given time,moving steering wheel sounds horn off without me pushing horn button.Dealer says its a spacer in the steering column that needs to get replaced as per service advisor part #2308600502 saying that that part is not covered, even if i have the extended warranty.. 1st asked if air bag was replaced under accident, no my air bag has never been replaced nor damaged before.