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Most horns are located behind the front bumper, and are accessible from below the spolier. I would give it a good look first, it may be a dirty/loose connection reducing the current to it (thereby weakening the sound). Sometimes there is a screw adjustment on the horn itself, which can alter the tone/pitch.
Other than that, its normally a straightforward item to replace.
Hope that helps,
This job should never be complete - the day I think I've done it all, is the day I resign.
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2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater