The Audi B8 S4 is known for its performance and handling. However, like any vehicle, it can experience issues with its steering assist system. This article addresses troubleshooting steering assist fault codes using VCDS (Vag-Com Diagnostic System) in a B8 S4. We’ll examine a specific case with persistent fault codes related to the steering and drive systems.
Understanding the Fault Codes
A VCDS scan revealed three primary fault codes:
- 0059 – Please Check Fault Codes in Control Module for ABS Brakes (U1017 00): This code suggests a problem within the ABS braking system, which can sometimes impact the steering assist system due to interconnected components.
- 0121 – Please Check Fault Codes in Steering Assist Control Module (U1020 00): This code directly points to an issue within the steering assist control module itself. Further diagnosis within this module is necessary.
- 0122 – Please Check Fault Codes in Steering Assist Control Module (U1020 00): This is a second fault code related to the steering assist control module, indicating a potentially more complex problem. The repetition of this code emphasizes the need for in-depth diagnostics.
Diagnosing with VCDS
The VCDS scan provides crucial information beyond the fault codes themselves:
- Control Module Part Number (8K0 907 163): Identifies the specific module requiring attention. This information is vital for researching potential solutions and ensuring compatibility with replacement parts if necessary.
- Mileage (180780 km): High mileage can contribute to wear and tear on steering components. While not directly indicative of the cause, it’s a factor to consider.
- Fault Frequency (1): Indicates that the faults have occurred consistently. This helps rule out intermittent issues and points to a persistent problem.
- MIL ON – Confirmed – Tested Since Memory Clear: Confirms that the malfunction indicator lamp (MIL) is illuminated and the faults are active and present even after attempting to clear them.
Next Steps for Resolving Steering Assist Issues
The provided VCDS log indicates a need for further investigation. Here’s a recommended approach:
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Check ABS System: Given the 0059 fault code, start by thoroughly inspecting the ABS system for any issues, including wiring, sensors, and the ABS module itself.
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Deep Dive into Steering Assist Module: Access the steering assist control module using VCDS and perform a more detailed scan. Look for specific fault codes within this module to pinpoint the root cause. This may involve checking measuring blocks, performing output tests, or accessing advanced diagnostic functions.
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Consult Repair Manuals and Online Resources: Utilize resources like factory repair manuals or online forums dedicated to Audi vehicles. Searching for solutions related to the specific fault codes found in the steering assist module will likely yield valuable insights.
Conclusion
Addressing steering assist fault codes in a B8 S4 requires a systematic approach. By utilizing VCDS and interpreting the provided data, technicians can effectively diagnose and resolve the underlying issues. The information presented here provides a starting point for troubleshooting these complex systems. Remember to always consult reputable resources and follow proper safety procedures when working on vehicle systems.
