A horn that no longer works could easily become unsafe and must be repaired as soon as possible. You need always, on your Audi A4, be able to report your presence thanks to this vital device. It may simply be broken and have a peculiar sound on your Audi A4, but nevertheless it is a problem that you must stop. The aim of this article is to go along with you step by step in this technique because you will realise that you can do it yourself without going to the garage for your Audi A4.
First, start by analysing where the failure came from. Based on this you will understand what repairs to do.
We will guide you step by step through the different tests:


Try honking the horn with the cover open. If you hear a sound, but much weaker than usual, it suggests that that some tubes are impaired but some still work. indeed, on your Audi A4 there are several trumpets that carry sound.
Step two, try to locate the horn. You will find it near the radiator at the front of your car, near the grille. The grille is the small grille at the front of vehicles that allows air to enter while protecting the parts of your Audi A4.

Horn cables unplugged on my Audi A4

Once the horn is identified, we will attempt to disconnect and reconnect the connecting wires in order to perform a new test. To do this, take the two connected wires, pull them out by their ends towards you. There should also be a horn fixing bolt that you need to unscrew. Then clean it all up with a brush or something, then reconnect it all. Try honking your horn again. Does it work?
You have found the solution for your Audi A4! If nothing changes, let’s go a little further in the tests and explanations.
You are faced with several solutions at this stage.

Faulty horn horn on my Audi A4

You could buy another tube to change the defective ones if you have been able to identify them on your Audi A4 thanks to the noise.

Fuse blown

it is advisable to also check the fuses. To find this fuse box, we invite you to look at our previous article on the subject:
“Where to find the fuse box on a Audi A4”
You should also look in your vehicle owner’s manual for the fuse references of the horn fuse that you must identify precisely.
Once the fuse is identified, you can remove it using a pair of pliers. To verify if it is burned, have a look at the metal part. If this one is blown, your fuse has blown on your Audi A4. It must consequently be replaced. If it looks new, it should not be questioned.
You can get this fuse in any car shop or garage. Test the horn again after the fuse has been changed. Is your horn working again? Congratulations! If this still doesn’t work for your Audi A4, check your dashboard and especially your airbag indicator light. If this one is on, there may be a link. Actually, it can have an influence on the rotating switch, a part that acts as a relay between the steering wheel and the horn. Having said that, for an airbag indicator problem on your Audi A4, it is recommended to go to a professional as it is more challenging to manage alone.


Here are the different causes that could have an impact on your Audi A4’s horn. Trumpets, fuses, rotating switch, airbag. Precisely identifying the fault will help you to solve it. Be vigilant to replace the fuse with an identical fuse of the same intensity.

If you need more guides on the Audi A4, go to our Audi A4 category.