Mercedes-Benz E-Class & CLS-Class Rear Air Spring Set A2123200725 A2123200825

Mercedes-Benz E-Class W212 & CLS-Class C218 – Rear Air Spring Set (Left & Right)

This listing covers a complete, side-specific rear air spring set for the Mercedes-Benz E-Class W212 and CLS-Class C218 chassis. These pneumatic bellows are directionally specific and cannot be interchanged.

• Rear Left (Driver): OEM part number A2123200725
• Rear Right (Passenger): OEM part number A2123200825

Note: These are standalone air bellows only. Unlike the front of the W212/C218 where the air spring and shock absorber are integrated into a single strut, the rear suspension separates the two components. This set replaces the pneumatic springs only, not the hydraulic shock absorbers.

When to Replace

• Rear end sagging or sitting on the tires after parking overnight
• Air compressor running continuously trying to maintain pressure
• Harsh or bouncy ride from loss of pneumatic support
• Airmatic malfunction warning on the dashboard

Why Replace as a Pair

Both bladders accumulate identical mileage and expansion cycles. A leaking left spring means the right has endured the same conditions and is equally at risk. Replacing as a matched set restores a level rear ride height and prevents a sudden failure from leaving the vehicle undriveable. Replacing the compressor relay simultaneously is strongly recommended if the compressor has been overworked due to a sustained leak.

Part Numbers & Interchange

Vehicle Fitment

Particularly common on S212 Wagons where self-levelling rear air suspension was standard. Always verify with your VIN before ordering.

What’s Included

• 1× Rear Left Air Spring / Bellow – replaces A2123200725
• 1× Rear Right Air Spring / Bellow – replaces A2123200825
• Rear shock absorbers, air compressor, and compressor relay not included.