A Guide to the 2009-2015 Audi A4 ABS Speed Sensor
Understand why your ABS, ESP, and parking brake lights are on and how to choose the right replacement sensor for your A4.
- A dashboard with ABS, ESP, and Parking Brake lights is the number one sign of a failed sensor.
- Use a diagnostic tool to confirm which specific wheel sensor has failed before buying parts.
- Before replacing the sensor, inspect the magnetic ring on the wheel bearing for rust or damage, which is a common related issue.
- Value-priced aftermarket sensors are available, but OEM-tier brands like Bosch offer the highest reliability for this critical safety part.
Is Your Audi A4 Dashboard Lit Up?
If you own a 2009-2015 Audi A4 (the B8 generation), a sudden group of warning lights on your dashboard is a classic sign of a failing ABS wheel speed sensor. It's very common to see the ABS, Electronic Stability Control (ESC/ESP), and Tire Pressure Monitoring System (TPMS) lights all come on at once. You may also see a "Parking Brake Malfunction" warning. This happens because all these safety systems need data from the wheel speed sensors to work. When one sensor fails, the car's computer shuts them all down as a safety precaution.
A Note on the Wheel Bearing
On this generation of Audi A4, the problem isn't always the sensor. The sensor reads a magnetic ring that is part of the wheel bearing's seal. Over time, this ring can be damaged by rust or debris. If the magnetic ring is the problem, a new sensor will not fix the issue, and the entire wheel bearing will need to be replaced. A visual inspection of the ring is a good idea before replacing the sensor.
Choosing the Right Aftermarket Sensor
When it's time to replace a sensor, you have a choice between original equipment (OEM) and aftermarket parts. For a critical safety component like an ABS sensor, quality is important.
- OEM-Tier Brands: Brands like Bosch are often the original manufacturer for Audi. Choosing a sensor from an OEM-tier brand usually guarantees the best fit, performance, and long life.
- Quality Aftermarket Brands: Companies like Febi, Bremi, Delphi, and Vemo offer a good mix of quality and price. They make parts that meet or exceed OEM standards and are a reliable, cost-effective choice.
- Value Brands: Basic aftermarket brands, such as the "Replacement" brand, offer the lowest price. While these can provide significant savings, their long-term reliability can be mixed. For a part that is simple to replace, some owners might find the savings worthwhile, but for a critical safety system, many prefer the peace of mind that comes with a more established brand.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Value) | $20.95 - $22.32 |
| New Aftermarket (Name Brand) | $25 - $75 |
| New OEM | $88 - $196 |
| Shop Labor | $53 - $95 |
Pro Tip: Diagnose Before You Buy
A diagnostic scan tool is essential to find out which specific wheel sensor has failed. This avoids the guesswork of replacing the wrong part. The tool will give you a fault code, like 00287 for the rear right sensor, that points directly to the problem sensor.
Frequently Asked Questions (FAQ)
Were there any recalls for this problem?
As of early 2026, there are no specific recalls for the ABS wheel speed sensors on the 2009-2015 Audi A4. However, there was a recall for the ABS *control module* on some 2009 models which can cause similar warning lights. It is always best to check for any open recalls on your vehicle by using your VIN.
Is this a difficult repair to do myself?
For many DIYers, this is a straightforward job. The sensor is held in by a single Allen bolt and an electrical connector. However, the sensor can sometimes get seized in the wheel hub due to rust and can be difficult to remove without breaking. Using penetrating oil can help. The difficulty is rated as low, and it typically takes under an hour.
Do I need to clear the codes after replacing the sensor?
Sometimes the warning lights will go off on their own after driving a short distance. However, it is often necessary to use a diagnostic scan tool to clear the fault codes from the car's computer to turn off the lights.
Are the front, rear, left, and right sensors the same?
No, they are often different. The front, rear, left, and right sensors can have unique part numbers and are not always interchangeable. It is critical to double-check that you are ordering the correct part for the specific corner of the car you are repairing.
Technical Specifications
OEM Part Numbers: 4E0927803F 4E0927804F 4E0927803D 4E0927804D
Sensor Type: Active Hall Sensor. Number of Pins: 2.
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 A4: