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Q: Horn sounds by itself

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While driving, the horn goes off.

This is generally caused by a short in the steering wheel cable reel assembly, but could also be a bad horn switch, or horn relay. If the cable reel is faulty, the steering wheel will have to be removed, and then set up in its neutral position, to avoid damage to the new cable reel assembly. You may want to enlist the assistance of a mechanic, such as one from YourMechanic, to inspect the horn circuit, and replace the horn switch, if necessary.

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