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Bilstein 40-221601 Air Suspension Spring - Rear Left
| Brand | Bilstein 40-221601 |
|---|---|
| Position | Rear Left |
| Finish | Black paint |
| Series | B3 oe replacement (air) |
| Title | Bilstein shock absorbers |
| Product line | B3 OE Replacement (Air) |
| Fits | BMW · 7 vehicles |
OE replacement air bag. Connects directly to original connectors for modification-free installation.
Black paint finish. Provides a clean, protective look on the suspension air bag.
OE supplier pedigree. Built to meet or typically exceed manufacturer standards.
Cross-references 37 12 1 095 579, 37 12 6 750 355 and 40-221571 for the same application. See all 3.
Bilstein B3 OE Replacement Air Spring
Restore the rear suspension feel on select BMW X5 models with this Bilstein B3 OE Replacement (Air) suspension air bag. Part number 40-221601 is built for direct connection to the original vehicle connectors, helping maintain factory-style operation without modification.
Bilstein’s B3 OE Replacement (Air) line focuses on direct-fit air suspension components for European vehicles, using OE-level engineering to match the original system layout and performance expectations.
Key Features
- OE-style air suspension spring for the rear left position
- Direct-connect design for modification-free installation
- Black painted finish
- Built for 2000-2006 BMW X5 rear left applications
- Bilstein B3 OE Replacement (Air) series
- Part number 40-221601 for accurate ordering and lookup
Detailed Description
This Bilstein air suspension spring is made for the rear left corner of the BMW X5 from 2000 through 2006. It replaces the original air bag on vehicles equipped with rear air suspension and is engineered to restore the original ride characteristics associated with the factory system. The direct-fit design supports a clean installation using the vehicle’s original connectors, and the black painted finish provides a durable OE-style appearance. Part number 40-221601 is also referenced for BMW X5 rear left air spring replacement searches.
This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.
Common Problems It Can Address
- Rear suspension sag on a BMW X5
- Uneven ride height at the rear left corner
- Air spring leakage from a worn original bag
- Loss of factory ride quality and support
- Suspension warning symptoms tied to air bag failure
Installation Notes and Tips
Verify the vehicle’s rear left air spring configuration before ordering. This part is listed for 2000-2006 BMW X5 rear left applications, and part number 40-221601 should be matched to the original unit and connector style before installation. Inspect related air suspension components for wear, leaks, or damage during replacement to help confirm proper system operation after service.
Quality Assurance
Bilstein is an OE supplier for air suspension systems, and the B3 OE Replacement (Air) line is built to meet the standards expected for original-equipment replacement on select European vehicles. The design emphasizes direct fitment and restoration of factory-style function for BMW X5 rear left air suspension service.
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 2006 | BMW | X5 | 4.8is | Rear Left | B3 OE Replacement (Air) |
| 2005 | BMW | X5 | 4.8is | Rear Left | B3 OE Replacement (Air) |
| 2004 | BMW | X5 | 4.8is | Rear Left | B3 OE Replacement (Air) |
| 2003 | BMW | X5 | 4.6is | Rear Left | B3 OE Replacement (Air) |
| 2002 | BMW | X5 | 4.6is | Rear Left | B3 OE Replacement (Air) |
| 2001 | BMW | X5 | 4.4i | Rear Left | B3 OE Replacement (Air) |
| 2000 | BMW | X5 | 4.4i | Rear Left | B3 OE Replacement (Air) |
| No rows match your filter. | |||||