2017-2023 Audi R8 & 2015-2024 Lamborghini Huracan Combination Switch: A Guide to Failures, Part Numbers, and Replacement
This guide covers the common failure symptoms, complex part numbers, and critical replacement procedures for the shared combination switch in the Audi R8 and Lamborghini Huracan.
- Compatibility is critical: You MUST match the OEM part number exactly to your car's options (cruise control, lane assist, etc.) to avoid functional problems and fault codes.
- Replacement is a job for professionals: The procedure involves removing the steering wheel and airbag, and requires mandatory Steering Angle Sensor calibration with a special scan tool afterwards.
- An airbag light is a major symptom: A common sign of failure is an SRS warning light, which means the driver's airbag is disabled and will not deploy in an accident.
- Used OEM is the best value: With no aftermarket options available, a quality used OEM switch provides factory performance for a fraction of the new dealer price.
Symptoms of a Failing Combination Switch
When the combination switch begins to fail in your Audi R8 or Lamborghini Huracan, it can create a variety of confusing and potentially dangerous electrical symptoms. Because it controls multiple, unrelated systems, a single faulty switch can make it seem like your car has several different problems at once. Here are the most common signs to watch for:
- Turn Signal Problems: This is often the first sign of failure due to frequent use. You may experience turn signals that don't work at all, work only intermittently, or fail to cancel after a turn.
- Headlight and High Beam Issues: You might find that your headlights won't turn on, get stuck in one mode (low or high beam), or you can't flash the high beams.
- Windshield Wiper Malfunctions: The wipers may not activate, get stuck on a single speed, or operate erratically.
- Multiple Failures at Once: A key indicator of a bad combination switch is when several of these functions fail simultaneously. For example, if both your turn signals and wipers stop working, the switch is a likely culprit. 🎬 Watch: How to diagnose a broken blinker or wiper switch.
- Airbag Warning Light: The combination switch assembly contains the clockspring, a rotary electrical connector that maintains a connection to the driver's airbag and steering wheel buttons while the wheel turns. A failure in the clockspring will disable the driver's airbag and illuminate the SRS/airbag warning light on your dash.
- Loss of Steering Wheel Controls: If the clockspring fails, you may also lose function of the horn, radio volume buttons, or other controls located on the steering wheel.
Known Issues, Recalls, and TSBs
As of early 2026, there are no specific recalls or widespread Technical Service Bulletins (TSBs) from Audi or Lamborghini for combination switch failure on the 2017-2023 R8 or 2015-2024 Huracan. While both vehicles have been subject to other recalls, none target this specific component. This suggests that failures are typically isolated incidents resulting from normal wear and tear rather than a manufacturing defect.
Note on Related TSBs: Audi has issued TSBs for other models (like TSB 94 24 81) that address grinding or squeaking noises from the steering column area when turning, which can be caused by the interaction between the switch electronics and the steering wheel. While not specific to the R8, if you hear such noises, it's worth investigating as it could be related to the switch assembly.
Buying a Used Combination Switch: What to Look For
A used OEM combination switch is an excellent way to save a significant amount of money compared to a new dealer part, especially for high-end vehicles like the R8 and Huracan. However, careful purchasing is essential. This is not a part where 'close enough' works.
1. The Part Number is Everything
This is the most critical step. These vehicles were available with several different options that are controlled by the combination switch, such as standard cruise control, adaptive cruise control (ACC), and lane-keeping assist. Each configuration uses a different switch. You MUST match the OEM part number from your original switch exactly.
- Known Part Numbers: The primary part numbers for these vehicles are 4S0907129K and 4S0907129N. The 'N' version is generally considered a later, updated replacement for the 'K' version, but both should be compatible if specified for your vehicle's original features.
- Verify Your Features: Do not buy a switch just because it came from the same model year. A switch from a car with adaptive cruise control will not work correctly in a car without it, and will likely cause fault codes and disable other functions.
- How to Find Your Part Number: The only guaranteed way to ensure compatibility is to have a professional remove the original switch and read the part number directly from the sticker on the housing.
2. Physical Inspection
Before purchasing a used unit, inspect it carefully:
- Stalks and Levers: Move the stalks through all their functions. They should move smoothly and click into place with a solid, positive feel. There should be no excessive looseness or binding.
- Connectors: Examine the electrical connector ports and pins. Look for any signs of corrosion (green or white powder), bent pins, or cracks in the plastic housing.
- Casing: Check the main body of the switch for any cracks or signs of damage from impact or improper removal.
3. Why Used OEM is the Best Choice
For vehicles like the R8 and Huracan, the choice is typically between new OEM and used OEM. Aftermarket manufacturers rarely produce complex electronic parts for such niche models. A used OEM switch provides the exact same quality, fit, and function as a new part from the dealer, but at a fraction of the cost.
Replacement Overview and Difficulty
Replacing the combination switch in an Audi R8 or Lamborghini Huracan is a complex task that should only be attempted by experienced DIY mechanics or a professional technician.
Warning: Airbag System: This procedure requires the removal of the driver's side airbag. Mishandling an airbag can result in accidental deployment and serious injury. Always disconnect the vehicle's battery for at least 30 minutes before beginning any work to allow the system's capacitors to fully discharge.
General Steps:
- Disconnect the negative battery terminal and wait 30 minutes.
- Remove the driver's side airbag module from the steering wheel.
- Remove the main steering wheel retaining bolt and the steering wheel itself. 🎬 See this walkthrough for removing a Lamborghini steering wheel.
- Remove the plastic shrouds around the steering column.
- Disconnect the electrical harnesses from the combination switch assembly and remove it from the column.
- Installation is the reverse of removal.
Calibration is Mandatory
After the new switch is installed, the Steering Angle Sensor (G85), which is integrated into the assembly, must be recalibrated. This sensor tells the ABS and Electronic Stability Control (ESC) systems the exact position of the steering wheel. Failure to perform this calibration will result in warning lights and disabled safety systems. This step requires a professional-grade diagnostic scan tool like VCDS (VAG-COM) or the dealer equivalent.
🎬 Watch: How to calibrate the steering angle sensor using VCDS.Cost Comparison
Prices for these exotic vehicles are high, and parts are no exception. This makes finding a quality used part a significant saving.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Part (Dealer) | $700 - $950 |
| Used OEM Part | $250 - $500 |
| New Aftermarket Part | Not Available |
| Shop Labor (1.5-2.5 hrs) | $300 - $500+ |
Note: Labor costs can vary significantly based on shop rate and location. Expect higher rates for shops specializing in European supercars.
Frequently Asked Questions (FAQ)
Can I drive my car with a bad combination switch?
It depends on the symptom. If your turn signals or headlights are inoperative, it is unsafe and illegal to drive. If the airbag light is on, the driver's airbag will not deploy in a crash. While the car may still physically drive, it is highly recommended to get the issue fixed immediately for safety reasons.
My airbag light is on. Is it definitely the combination switch?
Not necessarily, but it's a very common cause. The airbag light indicates a fault somewhere in the Supplemental Restraint System (SRS). A failed clockspring within the combination switch assembly is a frequent culprit, but the issue could also be a bad sensor or wiring elsewhere. A diagnostic scan is required to read the specific fault code and confirm the problem is with the clockspring (often called 'Driver's Side Airbag Igniter Circuit - Resistance Too High').
Can I install a switch with more features to upgrade my car?
No. Installing a switch designed for a car with Adaptive Cruise Control (ACC) into a car that didn't come with it from the factory will not enable ACC. The vehicle's control modules and wiring are not present to support the feature, and using the incorrect switch will cause fault codes and may disable other functions. You must use a switch that matches your car's original factory options.
Why does the steering angle sensor need to be calibrated?
The steering angle sensor tells the car's safety systems (like ABS and stability control) which way the front wheels are pointed. When you replace the switch assembly, the new sensor's 'zero point' or 'center' is unknown. Calibration uses a scan tool to teach the car the new sensor's straight-ahead position. Without this, the stability control could apply the brakes incorrectly, potentially causing a loss of control.
Technical Specifications and Part Numbers
OEM Part Numbers
- 4S0-907-129-K
- 4S0-907-129-N
- 4S0907129K
- 4S0907129N
- 4S0907129
Always verify the part number on your specific vehicle before ordering a replacement.
Helpful Videos
Technical Specifications
OEM Part Numbers: 4S0-907-129-K 4S0-907-129-N 4S0907129 4S0907129K 4S0907129N
Integrated assembly including stalks for turn signals, wipers, high beams, and the clockspring/steering angle sensor module. Communicates with the vehicle's Body Control Module (BCM) via LIN Bus.
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.
- Audi R8:
- Lamborghini Huracan:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Symptoms of a Failing Combination Switch
- Known Issues, Recalls, and TSBs
- Buying a Used Combination Switch: What to Look For
- 1. The Part Number is Everything
- 2. Physical Inspection
- 3. Why Used OEM is the Best Choice
- Replacement Overview and Difficulty
- Calibration is Mandatory
- Cost Comparison
- Frequently Asked Questions (FAQ)
- Technical Specifications and Part Numbers
- OEM Part Numbers
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