Audi S8 Horn Replacement Guide (2008-2013)
Diagnose and replace the weak or silent horn on your D3 generation Audi S8.
- The most common failure is a weak, high-pitched sound, which means the low-tone horn has failed, usually from water damage.
- Official replacement requires removing the front bumper cover, making it a 2-3 hour job for a professional.
- Before buying parts, check the horn fuse and listen for a relay click to rule out simpler electrical issues.
- The anti-theft alarm horn is a separate system; its failure does not affect the driving horn.
Is Your S8 Horn Not Working? Common Symptoms
The most common problem with the horn on the 2008-2013 Audi S8 is the failure of one of the two horn units, typically due to its exposed location at the front of the vehicle. This exposure to water and road debris can lead to corrosion and failure over time. Here are the signs that your horn may need replacement:
- Weak or "Scooter-Like" Sound: This is the most frequent symptom. It almost always means the low-tone horn has failed, leaving only the high-pitch horn working.
- Muffled or Distorted Sound: If the horn sounds strange or gurgles, it may have water inside it. An official Audi Technical Service Bulletin (TSB) addresses this exact issue, where water ingress from pressure washing can impair the horn's function.
- No Sound at All: If you hear nothing when pressing the horn, it could mean both horn units have failed, but it's also important to check other causes. Before ordering parts, check the horn fuse and listen for a clicking sound from the relay when the horn is pressed. A lack of a click could point to a bad relay or an issue with the clock spring in the steering wheel.
- Intermittent Operation: If the horn only works sometimes, it could be a sign of a failing horn unit, a bad relay, or a loose electrical connection.
Alarm Horn vs. Driving Horn
Your S8 has a separate horn for the anti-theft alarm system. If you get a "No Signal / Communication" fault for the Alarm Horn (H12) via diagnostics, this refers to the alarm siren, not the driving horns you operate from the steering wheel. A failing alarm siren will not affect the operation of your main horns.
Choosing the Right Aftermarket Horn: OEM vs. Hella
When replacing the horn on your S8, you have the choice between an original equipment (OEM) part from Audi or a quality aftermarket part. Given that the OEM horns are known to fail due to their placement, a reputable aftermarket brand is a strong alternative.
- OEM Horns: These are a direct replacement for the original part. However, they are susceptible to the same water damage issues that caused the original to fail. They are also the most expensive option.
- Hella Horns: Hella is a well-regarded German brand that is often an OEM supplier for various automakers. Many Audi owners choose Hella as a replacement for failed factory horns. They are known for their reliability and often provide a louder, more authoritative tone than the stock units. While some tests show they may not be drastically louder in decibels, their frequency is often more piercing and noticeable.
Pro Tip: Replace in Pairs
Your S8 uses a high-tone and a low-tone horn that are designed to work together. If one has failed due to age or water damage, the other is likely not far behind. For a balanced sound and to avoid doing the job twice, it is recommended to replace both horns at the same time.
Estimated Replacement Costs
The cost to replace the horn on an S8 can vary depending on the parts you choose and whether you perform the labor yourself.
| Part Type | Estimated Cost |
|---|---|
| New OEM Horn (Each) | $90 - $150 |
| New Aftermarket Horn (Hella, Each) | $73.17 |
| Used OEM Horn (Each) | $25 - $65 |
| Shop Labor | $250 - $450 |
Frequently Asked Questions (FAQ)
Where is the horn located on a 2008-2013 Audi S8?
The two horns (high and low tone) are located at the front of the vehicle, behind the large "fishmouth" grille and in front of the radiator. They are exposed to the elements, which is a common reason for their failure.
Can I replace the horn myself?
DIY replacement is possible for an experienced mechanic. The official procedure requires removing the front bumper cover to access the horns, which can take a couple of hours. Some owners have found a workaround by prying open the plastic trim above the grille to create enough space to reach the 10mm or 13mm nuts holding the horns, avoiding full bumper removal. This method is tight and requires care to avoid damaging the plastic grille.
Are there any recalls for the Audi S8 horn?
No, there are no specific NHTSA safety recalls for the horn on the 2008-2013 Audi S8. There is a Technical Service Bulletin (TSB) that acknowledges that water can get into the horn and cause it to sound distorted, advising replacement if draining the water doesn't solve the issue.
Do I need to replace a specific high or low-tone horn?
Yes, the system uses one of each. The low-tone horn is the one that most commonly fails, resulting in a weak, high-pitched sound. The horns are physically different and have unique part numbers. However, it is highly recommended to replace them as a pair.
Technical Specifications
OEM Part Numbers: 4E0951221 4B0951223A 8T0951223
System Type: Dual-tone electric horn (High and Low tone). Voltage: 12V.
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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