A Guide to the 2013-2020 Audi S7 ABS Wheel Speed Sensor
Understanding why your ABS and traction control lights are on and how to fix it.
- A lit ABS and traction control light together is the primary sign of a failed wheel speed sensor.
- You only need to replace the one failed sensor, which must be identified with a diagnostic scan.
- For best results, choose an OEM-supplier brand like Bosch, Hella, or Delphi.
- Driving with a bad sensor disables key safety features; replacement should not be delayed.
Understanding ABS Wheel Speed Sensor Failure on Your S7
A faulty ABS wheel speed sensor is a common issue on many vehicles, including the Audi S7 (C7 platform). When a sensor fails, it typically triggers the ABS and Electronic Stability Control (ESC/traction control) warning lights on your dashboard. This happens because the car's main computer loses the speed signal from one or more wheels, disabling these important safety systems as a precaution. The sensor is located at the wheel hub, where it is exposed to water, dirt, and road debris, which are the primary causes of failure.
Warning Lights are a Key Symptom
The most frequent sign of a bad wheel speed sensor is having both the ABS and traction control (ESC/ESP) lights illuminate on your instrument cluster at the same time. You may also see messages like "Stabilisation system fault."
Choosing the Right Aftermarket ABS Sensor
When replacing an ABS sensor on a high-performance vehicle like the S7, part quality matters. While an OEM sensor from an Audi dealer is always an option, the aftermarket offers several quality choices, often at a better price. Aftermarket brands can be grouped into tiers based on their reputation for quality and reliability.
Tier 1: OEM Supplier Brands
These brands are known to manufacture parts for Audi and other German automakers. They are the safest bet for quality and fitment, often identical to the part you'd get from the dealer, just in a different box.
- Bosch: Widely regarded as an original equipment manufacturer for Audi's electronic components. Choosing Bosch is the closest you can get to the original part's quality and is highly recommended by enthusiasts and mechanics.
- Hella: Another top-tier German brand that supplies electronics to major car manufacturers. Hella parts are known for their durability and reliability.
- Delphi: A global OEM supplier with a strong reputation for electronic and braking system components.
Tier 2: Reputable Aftermarket Brands
These companies are well-established in the aftermarket and produce reliable parts, though they may not be the original supplier to Audi.
- Standard Ignition (SMP): A long-standing brand known for a wide range of quality electronic and engine management parts.
- Bremi: A German company specializing in ignition and sensor technology, offering a solid alternative.
Tier 3: Budget-Friendly Options
These brands offer a lower price point. They can be a viable option for those on a tight budget, but may have a higher risk of premature failure or fitment issues compared to top-tier brands.
- Vemo: Often considered a budget-friendly brand for German car parts.
- URO Parts: Known for providing a wide range of affordable parts, but their electronic components have a mixed reputation in online forums.
- Facet: An Italian brand that produces a variety of electronic components.
Pro Tip: Match the Part Number
Always verify the OEM part number for your specific vehicle and ensure the aftermarket part is a direct cross-reference. Sensors can be specific to front, rear, left, or right positions. Using a VIN lookup tool or checking with the seller is a good practice before ordering.
Cost of Replacing an Audi S7 ABS Sensor
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Sensor | $29 - $95 |
| New OEM Sensor (Dealer) | $150 - $250 |
| Shop Labor | $100 - $180 |
| Total (Shop Installed Aftermarket) | $129 - $275 |
Frequently Asked Questions
Can I replace an ABS sensor myself?
Yes, for many DIYers, this is a manageable job. It typically involves removing the wheel, unscrewing a single bolt holding the sensor, and disconnecting the electrical plug. The most common difficulty is the sensor seizing in the wheel hub due to rust, which may require careful extraction to avoid breaking it.
Do I need to replace all four sensors at once?
No. You only need to replace the specific sensor that has failed. A diagnostic scan tool is needed to read the fault code, which will tell you which wheel's sensor is bad (e.g., 'Right Front Wheel Speed Sensor'). However, since the sensors are the same age, it's not uncommon for another one to fail in the future.
Are there any recalls for the S7 ABS sensor?
As of early 2026, there are no specific recalls issued by the NHTSA for the ABS wheel speed sensor on the 2013-2020 Audi S7. Always check for the latest recall information using your vehicle's VIN on the NHTSA website.
What happens if I ignore a bad ABS sensor?
Your vehicle's ABS, traction control, and stability control systems will be disabled. This means in an emergency stop, your wheels could lock up, increasing stopping distance and causing a loss of steering control. While the car's standard brakes will still work, these crucial safety features will not.
Technical Specifications
OEM Part Numbers: WHT003856 WHT003857 WHT003858 WHT003859
The Audi S7 uses active Hall-effect sensors, which generate a digital square-wave signal. They are position-specific (front/rear and sometimes left/right).
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 S7:
- 🛍️ Shop This Part
- Understanding ABS Wheel Speed Sensor Failure on Your S7
- Warning Lights are a Key Symptom
- Choosing the Right Aftermarket ABS Sensor
- Tier 1: OEM Supplier Brands
- Tier 2: Reputable Aftermarket Brands
- Tier 3: Budget-Friendly Options
- Pro Tip: Match the Part Number
- Cost of Replacing an Audi S7 ABS Sensor
- Frequently Asked Questions
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