I'd first check the fuse box. There may be one labeled HORN.
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How do I set the time on the clock on a 1995 Mercedes C220
To disable the horn on a 1995 Mercedes Benz C220, you can disconnect the horn relay located in the fuse box or remove the fuse associated with the horn circuit. The fuse box is typically located near the driver's side dashboard or under the hood. Alternatively, you can disconnect the horn itself, which is usually located near the front of the vehicle behind the grille. Always ensure to check your owner's manual for specific details regarding the horn's electrical components.
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Since its first version, there have been many versions of the C220 launched. The newest 2013 version of the Mercedes Benz C220 launched at the Geneva Auto Show in February 2012.
expensive oil
In the trunk under the mat.
To replace the timing chain on the Mercedes Benz 2012 C220 Codi you need to refer to your user's manual.
To replace the timing belt Mercedes Benz 2012 C220 Codi, you need to refer to the user manual.
About 4.4 L
You have a problem, take it to Mercedes agency.