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Bilstein 44-239985 Air Suspension Strut - Rear Left
| Brand | Bilstein 44-239985 |
|---|---|
| Position | Rear Left |
| Boot Included | No |
| Finish | Black paint |
| Internal Design | Monotube |
| Lower Mount Type | Eye |
| Series | B4 oe replacement (air) |
| Title | Bilstein shock absorbers |
| Upper Mount Type | Multiple studs |
| Product line | B4 OE Replacement (Air) |
| Fits | Mercedes-Benz · 7 vehicles |
OE replacement. Direct-connect fit restores the original feel without modifications.
Monotube design. Delivers consistent damping performance in an air suspension strut.
OE supplier pedigree. Built to meet manufacturer standards for air suspension systems.
Cross-references 222 320 53 13, 222 320 73 13 and 222 320 73 13 89 for the same application. See all 3.
Bilstein B4 OE Replacement Air Strut
Bilstein 44-239985 is a rear left air suspension strut for select Mercedes-Benz S550 and S550e models. Built for OE-style replacement, it connects directly to the original vehicle connectors and restores the factory ride feel without modification.
Key Features
- Bilstein B4 OE Replacement (Air) series for factory-style air suspension service
- Monotube internal design for consistent damping response
- Black painted finish
- Lower eye mount and upper multiple-stud mount
- Rear left position for confirmed Mercedes-Benz fitment
- Part number 44-239985 for ordering and cross-reference
Product Details
The Bilstein B4 OE Replacement (Air) line is built for European vehicles that use air suspension, including Mercedes-Benz applications. As an OE supplier for air suspension systems, Bilstein engineers this strut to match original equipment standards and preserve the vehicle’s original suspension behavior. For drivers searching for a Mercedes-Benz S550 rear left air suspension strut or a Mercedes-Benz S550e rear left replacement damper, 44-239985 provides a direct-fit solution with factory connector compatibility.
This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.
Vehicle Fitment
- Fits 2014-2017 Mercedes-Benz S550, rear left, without Active Body Control; B4 OE Replacement (Air)
- Fits 2015-2017 Mercedes-Benz S550e, rear left, B4 OE Replacement (Air)
Common Issues This Part Addresses
- Rear suspension sag on the left side
- Loss of factory ride control from a worn air strut
- Uneven rear stance on Mercedes-Benz S550 and S550e models
- Noisy or inconsistent damping from aging suspension components
- Need for an OE-style replacement that uses original connectors
Installation Notes
Verify rear left fitment before installation and confirm the vehicle is equipped with the listed suspension configuration. This air suspension strut is designed to connect to the original vehicle connectors and use the specified eye and multiple-stud mounting points. Always inspect related suspension components, air lines, and mounting hardware condition during replacement.
Quality Assurance
Bilstein supplies OE air suspension systems and builds the B4 OE Replacement (Air) line to meet the standards expected for original-equipment service on European vehicles. Part number 44-239985 is engineered as a direct replacement for the listed Mercedes-Benz applications.
| Year | Make | Model | Submodel | Body Type | Position | Notes |
|---|---|---|---|---|---|---|
| 2017 | Mercedes-Benz | S550 | Base | Sedan | Rear Left | Without Active Body Control; B4 OE Replacement (Air) |
| 2017 | Mercedes-Benz | S550e | Base | — | Rear Left | B4 OE Replacement (Air) |
| 2016 | Mercedes-Benz | S550 | Base | — | Rear Left | Without Active Body Control; B4 OE Replacement (Air) |
| 2016 | Mercedes-Benz | S550e | Base | — | Rear Left | B4 OE Replacement (Air) |
| 2015 | Mercedes-Benz | S550 | Base | — | Rear Left | Without Active Body Control; B4 OE Replacement (Air) |
| 2015 | Mercedes-Benz | S550e | Base | — | Rear Left | B4 OE Replacement (Air) |
| 2014 | Mercedes-Benz | S550 | Base | — | Rear Left | Without Active Body Control; B4 OE Replacement (Air) |
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