Lowering the suspension on your Audi S7 can enhance its appearance and handling. VCDS, the Ross-Tech Vag-Com Diagnostic System, allows for precise adjustments to achieve the desired ride height. However, modifications to the air suspension system can sometimes trigger fault codes. This article outlines the process for lowering your Audi S7 suspension using VCDS and provides troubleshooting steps for common fault codes that may arise.
Lowering Your Audi S7 Suspension with VCDS
Before starting, ensure your S7 is on level ground, in “Auto” mode, and not in towing or tire changing mode. Close all doors, as opening them will interrupt the procedure.
- Access Module 34: Connect VCDS to your vehicle and navigate to Module 34 – Level Control.
- Record Current Values: In “10 – Adaptation,” note the four values for “Body height front left wheel house edge,” “Body height front right wheel house edge,” “Body height rear left wheel house edge,” and “Body height rear right wheel house edge.” These values represent the factory suspension settings.
- Calculate New Values: Add your desired drop in millimeters (mm) to each of the recorded values. For example, if the front left value is 384 and you desire a 15mm drop, the new value would be 399. Audi recommends a maximum drop of 17mm. Exceeding this may impact other systems like cameras and adaptive cruise control. For optimal accuracy, measure the distance from the wheel center to the fender edge after step 7 and add your desired drop to those measurements.
- Obtain Security Access: Access the “Security Access” function within VCDS. You will need a security access code specific to this module. This code can often be found on online forums dedicated to VCDS coding.
- Enter Security Code: Enter the security access code obtained in the previous step. A successful entry will be confirmed with a message.
- Access Basic Settings: Navigate to “04 – Basic Settings.” Caution: Avoid selecting “Reset All Adaptations,” as this action requires a dealer visit to reverse.
- Activate Level Control: Select “Activate Level Control” and press “Go.” This process should complete quickly.
- Delete Calibration: Select “Delete Calibration For Level Control” and press “Go.” An “Air Suspension Malfunction” error is expected at this stage.
- Start Up to Reference Level: Select “Start Up to Reference Level” and press “Go.” The car will adjust its height, accompanied by hissing noises. This process takes approximately one minute. Do not use the “Start Up to Reference Level Production” option.
- Enter New Adaptation Values: Return to “10 – Adaptation.” Select each “Body height…” adaptation channel individually and enter the corresponding new value calculated in step 3. Confirm each entry by clicking “Do it!”
- Calibrate Level Control: Go back to “04 – Basic Settings” and select “Calibrate Level Control,” then press “Go.”
- Reactivate Level Control: Select “Activate Level Control” and press “Go.”
- Clear Fault Codes: Navigate to “02 – Fault Codes” and clear any existing codes.
Troubleshooting Air Suspension Fault Codes
Even with careful execution, fault codes can sometimes appear after adjusting the suspension. Here’s an example of troubleshooting steps:
A blown 40 amp orange fuse in the trunk can cause various air suspension faults. Replacing this fuse often resolves the issue. If the problem persists, a VCDS scan can provide specific fault codes, such as a leak in the pressure accumulator (code C11AF). This information helps diagnose the problem and guide further repairs. Refer to the Ross-Tech Wiki for detailed information on specific fault codes and potential solutions.
Conclusion
Lowering your Audi S7 with VCDS offers a customizable driving experience. However, it’s crucial to follow the procedure meticulously and address any resulting fault codes promptly. Utilizing resources like the Ross-Tech Wiki and online forums can provide valuable insights into resolving these issues. Remember to always prioritize safety and consult a qualified technician if you encounter complex problems.
