Bilstein 44-400156 B4 Air Suspension Strut for 21-25 Mercedes S-Class W223

Vehicle Fitment

• 2021-2025 Mercedes-Benz S-Class W223 / V223 / Z223 (S350d, S400d, S450, S500, S580, S580e, S680 Maybach, 4MATIC AWD)

Fitment Notes

• Front axle left position only
• Designed for vehicles equipped with factory AIRMATIC air suspension systems
• Must match OEM air suspension-equipped S-Class platforms (not coil spring variants)
• Pair with corresponding right-side unit (44-400224 or OEM equivalent)

Features

• OE replacement Bilstein B4 Air suspension strut
• Integrated air spring and monotube shock absorber design
• Restores factory ride height and comfort characteristics
• Direct plug-and-play OEM-style installation
• High-pressure gas monotube damping technology
• Designed for adaptive air suspension systems
• Maintains electronic ride control compatibility
• Engineered for luxury comfort and stability under load

Specifications

• Part Number: 44-400156
• Position: Front Axle Left
• Shock Type: Gas pressure monotube
• Spring Type: Air spring (AIRMATIC)
• Mounting Style: OEM direct-fit air suspension module
• Platform: Mercedes-Benz W223 / V223 / Z223
• Drivetrain: 4MATIC AWD compatible
• OE Cross Reference: A2233207302 / A2233205303 (varies by application)

Included Components

• 1x Bilstein 44-400156 Front Left Air Suspension Strut

Product Description

The Bilstein 44-400156 is a premium OE replacement front left air suspension strut designed for modern Mercedes-Benz S-Class vehicles equipped with AIRMATIC systems. It integrates a monotube gas-pressure shock absorber with an air spring module to restore factory ride quality, handling precision, and comfort performance.

Engineered specifically for W223, V223, and Z223 platforms, this unit is built to match original suspension geometry and electronic damping systems. It ensures proper ride height control, stability under load, and seamless interaction with factory air suspension controls.

Ideal for restoring worn or leaking factory air struts, the Bilstein B4 Air system provides OE-level performance with improved durability and consistent damping response, making it suitable for luxury sedan comfort and long-distance driving stability.