A Sagging Mercedes Gets New Shocks But Still Needs Fine-Tuning

The owner of a W166 350 4MATIC noticed something odd after parking: the rear right corner of the car would sink about 3 to 4 centimeters within a couple of hours. It was easy to spot just by looking. Looking for a budget-friendly fix, they first took the SUV to a Toyota mechanic working after hours.

That mechanic spotted leaking oil and gas from the rear shocks, but the air springs passed the standard soapy-water leak test.

The owner decided to replace both rear shocks (Febi-Bilstein 27-271001) and both rear air springs (Arnott A-2596) with a different mechanic. The parts went in fine, and the car now holds its height for days at a time. It even raises to the max setting when commanded, and no error messages appear on the dashboard.

But there’s a catch: the mechanic wasn’t trained in the final recalibration step.

After driving, the owner measured from the fender to the ground at all four corners. The left and right sides show a difference of about one centimeter, sometimes a bit more, sometimes a bit less. They own an OTOFIX D1 Lite diagnostic tool for reading and clearing faults, but they don’t have the exact steps or data to recalibrate the suspension themselves.

If anyone at Boca Auto Care can walk them through the process or handle the recalibration, they’d be grateful for the assist.