Lowering D4 via VCDS: A Step-by-Step Guide

Lowering your Audi D4 can dramatically improve its handling and aesthetics. While professional installation is always an option, using VCDS (Vag-Com Diagnostic System) allows for precise DIY adjustments. This guide provides a detailed walkthrough on how to lower your D4 using VCDS.

Understanding Factory Ride Height and VCDS Adjustments

Before starting, it’s crucial to understand your D4’s factory ride height. Measure the distance from the center of each wheel to the lower fender edge in millimeters. These measurements serve as your baseline. To adjust the ride height, VCDS allows you to modify specific coding parameters within the Level Control module.

Accessing Level Control Module in VCDS

1. Connect your VCDS interface to your D4’s OBD-II port and launch the software.
2. Select [Select] then [34 – Level Control].
3. Access the coding section via [Coding – 10].

The stock code typically resembles “0015510.” The two “5” digits control ride height: the first for the front axle and the second for the rear. Lowering is achieved by reducing these digits (4-0 corresponds to a 5-25mm drop per digit), while increasing them (6-9) raises the vehicle by 5-20mm per digit. This modification uniformly adjusts all MMI ride height settings. After making your desired changes, click [Do It].

Implementing Ride Height Changes with VCDS

To finalize the adjustments:

1. Ensure your D4 is parked on a level surface, the transmission is in Park, the engine is running, and all doors are closed.
2. Re-measure the distance from the wheel center to the lower fender edge in millimeters for each corner and record these values.
3. In VCDS, navigate back to [34 – Level Control] and enter Security Access mode via [Security Access – 16].
4. Enter the code 31564 and click [Do It!].
5. Select [Adaptation – 10]. Wait for the suspension to cycle through its adjustment process until a “Ready” message appears.

Adjusting Individual Corner Heights

The “Stored Value” field now displays the “TARGET” ride height value. Factory default TARGET values are typically 416mm (front) and 398mm (rear). Adjusting the coding digits (as explained earlier) alters these TARGET values accordingly. For instance, changing the “5” to a “4” results in TARGET values of 411mm (front) and 393mm (rear).

1. Select Channel 01 (front left).
2. Enter your measured value for the front left corner.
3. Click [Test]. If VCDS displays an “INVALID” message, incrementally adjust the entered value towards the TARGET value until a “VALID” message is received.
4. Once “VALID,” click [Save].

Repeat this process for the remaining corners: Channel 02 (front right), Channel 03 (rear left), and Channel 04 (rear right).

Saving and Fine-Tuning Adjustments

1. Select Channel 05 (Save) and enter 1.
2. Click [Test] then [Save].
3. Finally, select [Done, Go Back].

If VCDS initially rejected your measured values, drive the vehicle briefly and repeat the Adaptation process. Minor adjustments (within a few millimeters) can be made by entering slightly different values during the Adaptation process. However, aiming for precision beyond 2mm is generally unnecessary. Remember, these adjustments are specific to your vehicle and preferences.