HomeSuspension > Suspension, Springs and Related ComponentsBilstein 40-221601 Air Suspension Spring - Rear Left
Part #: 40-221601

Bilstein 40-221601 Air Suspension Spring - Rear Left

B3 OE Replacement (Air), Rear Left
⚙️ 7 vehicles fit this part
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Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
📦B3 OE Replacement (Air), Rear Left
🚗Fitment: BMW, X5
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Reliable Air Suspension Spring for BMW X5

The Bilstein 40-221601 air suspension spring is designed specifically for BMW X5 models, providing a direct replacement that maintains your vehicle's original ride quality. Engineered with a durable black paint finish, this air spring ensures long-lasting performance and corrosion resistance.

Key Features of Bilstein 40-221601 Air Suspension Spring

  • Compatible with BMW X5 air suspension systems
  • Finished with protective black paint for durability
  • Part of the B3 OE Replacement (Air) series for reliable OE fitment
  • Designed to restore factory ride height and comfort
  • Part number 40-221601 ensures precise identification and fit

About the B3 OE Replacement (Air) Product Line

The B3 OE Replacement (Air) series by Bilstein focuses on providing high-quality air suspension components that meet original equipment specifications. This product line is engineered to offer a balance of performance and durability, making it suitable for restoring the suspension system of vehicles like the BMW X5 without compromising ride comfort or handling characteristics.

Product Description and Application

The Bilstein 40-221601 air suspension spring is crafted to replace worn or damaged air springs on BMW X5 models. Its black paint finish protects against environmental factors, helping to extend the lifespan of the suspension component. This air spring is designed to work seamlessly with the vehicle’s existing suspension system, ensuring consistent ride height and smooth handling.

Common Issues Addressed by This Air Suspension Spring

  • Loss of ride height or uneven suspension
  • Air spring leaks causing poor ride quality
  • Reduced suspension responsiveness or comfort
  • Noise or vibration from worn suspension components
  • Failure of original air springs due to wear or damage

Installation Notes and Tips

When installing the Bilstein 40-221601 air suspension spring, ensure the vehicle is properly supported and the air suspension system is depressurized. Verify compatibility with your BMW X5 model year and inspect related suspension components for wear. Professional installation is recommended to maintain system integrity and safety.

Quality Assurance and Warranty

Bilstein manufactures the 40-221601 air suspension spring to meet strict quality standards, ensuring reliable performance and durability. While specific warranty details are not provided here, Bilstein products typically come with manufacturer-backed warranties to protect against defects in materials and workmanship.

BrandBilstein
Part Number40-221601
PositionB3 OE Replacement (Air), Rear Left
FinishBlack paint
SeriesB3 oe replacement (air)
TitleBilstein shock absorbers

This part fits 7 vehicles. Search below:

YearMakeModelSubmodelPositionNotes
2006BMWX54.8isRear LeftB3 OE Replacement (Air)
2005BMWX54.8isRear LeftB3 OE Replacement (Air)
2004BMWX54.8isRear LeftB3 OE Replacement (Air)
2003BMWX54.6isRear LeftB3 OE Replacement (Air)
2002BMWX54.6isRear LeftB3 OE Replacement (Air)
2001BMWX54.4iRear LeftB3 OE Replacement (Air)
2000BMWX54.4iRear LeftB3 OE Replacement (Air)

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

37 12 1 095 57937 12 6 750 35540-221571

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.