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In regards to city/highway horns (fanfare horns I think the quieter ones are called) this was only an option for a few years it seems like, may have even been standard for awhile. I thought there was some market where it was required (I want to say NYC) but no idea why it would have only been installed on S class models if that is the case.
In regards to the E class horns, one or both horns is failing, it/they need to be replaced.
Gilly
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