The Bosch ACC radar unit (MQB H04 0194) in a Skoda Superb requires precise alignment for proper functionality. This unit, located centrally behind the front grille, relies on primary mechanical alignment. Accessing it involves removing the two plastic engine bay covers and releasing the cover clips. While VCDS diagnostic software can provide extended UDS fault details for alignment issues on current-generation interfaces, it’s crucial to understand that fault codes won’t clear until a full re-learn procedure is completed.
A common issue with these units is the fragility of the mounting bracket. The plastic can become brittle over time and fracture due to road shocks, leading to misalignment. In a specific instance, a cracked bracket was replaced with a new one, carefully aligned by measuring the old broken bracket for reference. While a professional alignment using a dedicated fixture is recommended, initial testing yielded positive results.
After approximately 10 miles of driving, the ACC fault light extinguished, and the system functioned normally. Tests involving various obstacles, including standing traffic, cyclists, and other vehicles, showed accurate obstacle recognition and appropriate speed adjustments. Braking performance remained unaffected. This successful outcome, achieved without professional alignment equipment, suggests that careful manual alignment based on the old bracket’s measurements can be effective in some cases.
However, it’s essential to emphasize that professional alignment with the proper fixture is the preferred method for ensuring optimal ACC performance. While manual alignment might temporarily restore functionality, it may not achieve the same level of precision and long-term reliability. Using VCDS to diagnose and clear fault codes after alignment and the re-learn procedure is essential. Identifying the root cause of the failure, such as a cracked bracket, allows for proactive repairs and potentially avoids higher costs associated with specialist alignment services. Ultimately, addressing the underlying issue and ensuring proper alignment, whether manually or professionally, is vital for maintaining the safety and functionality of the Skoda Superb’s ACC system.
