Guide to Horn Replacement for the 2004-2016 Audi A4
If your Audi A4's horn sounds weak or doesn't work at all, this guide explains why and what you need to fix it.
- The most common failure is a weak, high-pitched sound, which means the low-tone horn has failed due to water or debris exposure.
- Replacement is labor-intensive, as the front bumper cover must be removed to access the two horns.
- Before buying parts, check the horn fuse and listen for a relay click to rule out simpler electrical issues.
- A known issue, documented by an Audi TSB, is water getting into the horn from pressure washing, causing poor sound quality.
Is Your Audi A4 Horn Failing?
A common issue on the 2004-2016 Audi A4 is a change in the horn's sound or complete failure. Due to their location behind the front bumper, the horn units are exposed to water, road salt, and debris, which leads to corrosion and eventual failure. Often, only one of the two horns stops working, which dramatically changes the sound.
Symptoms of a Bad Horn
Before you buy a new part, make sure you know what to look for. The signs of a failing horn can range from subtle to obvious.
- Weak or "Scooter" Sound: This is the most common symptom. It happens when the low-tone horn fails, leaving only the high-pitched horn working.
- No Sound at All: If you hear nothing when pressing the horn, both units may have failed, or you could have an electrical issue like a blown fuse, bad relay, or a problem in the steering column's clock spring.
- Muffled or Gurgling Sound: This often indicates the horn has taken on water. A Technical Service Bulletin (TSB) from Audi acknowledges that water ingress, especially from pressure washing, can impair the horn's function.
- Intermittent Operation: If the horn works sometimes and not others, it could be a loose electrical connection, a failing relay, or internal corrosion in the horn itself.
Official Audi Technical Service Bulletin (TSB)
Audi released TSB 90 24 08 2074436/1 for poor horn sound quality on vehicles from 2011-2024. The bulletin states that water can get inside the horn, especially from pressure washers, causing a distorted or quiet sound. The suggested fix is to remove the horn, drain the water, and test it. If the problem persists, the horn needs to be replaced.
🎬 Watch: Troubleshooting and replacing a failed Audi A4 hornChoosing the Right Aftermarket Horn
When replacing the horn on your A4, you have options. While OEM horns are available from the dealer, a quality aftermarket part can offer the same performance for less money. Hella is a well-regarded German brand that is often an original equipment manufacturer for many European car brands. Their horns are known for their durability and proper tone, making them a reliable choice for your Audi. Since the replacement job requires significant labor, choosing a quality part that will last is a smart investment.
Pro Tip: Replace in Pairs?
If one of your horns has failed, the other one has been exposed to the same age and conditions. Since replacing the horns requires removing the front bumper, many owners choose to replace both the high-tone and low-tone horns at the same time to avoid doing the job twice.
Audi A4 Horn Replacement Cost
The cost to replace the horn on a 2004-2016 Audi A4 can vary. The biggest factor is the labor involved in removing the front bumper.
| Part Type | Estimated Cost |
|---|---|
| New OEM Horn (Single) | $60 - $209 |
| New Aftermarket Horn (Set) | $71 - $74 |
| Shop Labor | $136 - $350 |
| Total Estimated Cost | $207 - $559 |
Frequently Asked Questions
Why did my Audi's horn suddenly sound high-pitched?
This is the classic sign that your low-tone horn has failed. Your A4 uses two horns together. When the low-tone unit fails from corrosion or water damage, you are left hearing only the high-tone horn, which sounds weak and tinny by itself.
Is replacing the horn on an A4 a DIY job?
It can be, but it is an advanced project. The job requires removing the front bumper cover to access the horns. This involves removing screws in the wheel wells, under the engine, and on top of the grille area. If you are not comfortable with this level of disassembly, it is best to leave it to a professional. 🎬 See this step-by-step guide to removing the front bumper The difficulty is rated 4 out of 5.
Where are the horns located on a 2004-2016 Audi A4?
The two horns are located behind the front bumper cover, typically mounted to the car's impact bar or on either side of the radiator. You cannot see or access them without first removing the bumper cover.
Could a fuse be the problem?
Yes, a blown fuse will cause the horn to stop working completely. Before ordering parts, it's always a good idea to check the fuse. The fuse location can vary by year and model, so consult your owner's manual for the correct fuse box diagram. The fuse panel is often located on the side of the dashboard, accessible when the driver's door is open.
🎬 Watch: Locate and test your horn fuse and relayHelpful Videos
Technical Specifications
System Type: Dual-tone (High and Low Pitch)
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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