Lowering by coding is a no-brainer, these are the instructions using INPA:
With INPA installed, connect the cable to the car, ignition on but don't start the car. Start INPA. You will see 2 circles at the top of the screen, battery and ignition, which should go black once you're connected.
- Select F07/F10/F11. This opens a Script Selection window
- Single Click on Suspension on the left
- You'll see a menu appear on the right
- Select Electronic Ride Height Control by double clicking it
- This opens a page all in German (Luftfederung)
- On mine, the command is Ansteuren (F6). Click on this. Ansteuren means 'control'
- On the next page, click Shift+F4 Abgleichen (ICMQL) F11. Abgleichen means calibrate.
- This opens a page where Fahrzeugsollhohe Hinterachse is written (Car theoretical height rear axle).
- Select your wheel size using F1 to F5
- Next, at the bottom click Abgleich (F8 on mine)
- This opens a pop up window which has two input lines - links (left) and rechts (right).
- Using the table in the background, you'll see some values of heights. So mine (on 18in wheels) was 630mm. I then put 650 into both boxes on the pop-up box, then pressed OK. This way I've told the car I've measured the rear height & it's 650mm. The car knows it should be 630mm, so it lowers the rear by 20mm.
- Lower more if you want by adding the desired drop to the base reading, but in general 20mm is 'safe'. Otherwise you can end up on the bump stops.
- Once you've pressed OK it'll confirm that this level has been saved to the ECU (EEPROM); this is a permanent change, but don't worry, you can change it if you're not happy.
- F10 always get you back to the previous page (Zuruck = back).