Bilstein 40-221601 BMW X5 E53 B3 OE Replacement Rear Left Air Suspension Spring
Restore your BMW X5 E53 ride quality with the Bilstein B3 rear left air suspension spring, part number 40-221601. This OE-spec air spring is a direct-fit replacement for the rear left nearside on BMW X5 E53 models, including 3.0i, 4.4i, 4.6is, 4.8is and 3.0d. If your X5 has a sagging rear, uneven ride height, compressor overworking or air leaks from a worn airbag, the Bilstein B3 air spring is the proven solution to bring back factory comfort, handling and stability.
Keywords customers use for this item: BMW X5 E53 rear left air spring, rear left airbag, rear left air suspension spring, BMW X5 air suspension bag, BMW X5 E53 air spring bag, OE replacement air spring, Bilstein B3 air spring, 40-221601, BILSTEIN-40-221601, rear nearside air suspension, BMW X5 2000-2006 air suspension repair.
Why choose Bilstein B3 for your BMW X5 E53
- OE-quality fit and performance for BMW X5 E53 rear left air suspension
- Uncompromising comfort and driving characteristics with factory-correct ride height
- Rapid response to road and load changes for confident handling
- Consistent support under any load for safer, more stable driving
- High power reserves for maximum safety and longevity
- Ideal OE replacement where the air spring and shock absorber are separate units
At Nforcd we have fitted these Bilstein B3 air springs to customer X5 E53 models and feedback has been excellent. Ride quality, levelling and stability are restored, and owners appreciate the precise fit and OE-level performance.
Product details
| Fitting Position | Rear Axle Left (nearside) |
| Spring Design | Air Spring |
| Manufacturer Part Number | 40-221601 |
| Nforcd SKU | BILSTEIN-40-221601 |
| EAN | 4025258727352 |
| UPC | 651860728223 |
Vehicle compatibility
BMW X5 E53 01.2000 to 12.2006:
- 3.0i
- 4.4i
- 4.6is
- 4.8is
- 3.0d
Matched right-hand side
For the corresponding rear right offside air suspension spring, see Bilstein 40-221618 BMW E53 B3 OE Replacement Rear Right Air Suspension Spring.
Compatibility check
We run a compatibility check prior to dispatch to ensure perfect fitment. Enter your UK registration number or the last 7 of your VIN at checkout and we will verify this part suits your vehicle.
Installation and fitment
Professional installation is recommended. Nforcd offers expert fitting at our workshop in Warwickshire. To request a fitting quote or book an appointment, email Sales@nforcd.com.
Tip: many owners replace rear air springs in pairs to maintain balanced ride height and performance.
Common search terms
BMW X5 E53 rear air spring, BMW X5 rear left airbag, BMW X5 rear air suspension bag, BMW X5 E53 air suspension spring replacement, BMW X5 sagging rear fix, X5 E53 air suspension leak, Bilstein B3 air spring 40-221601, OE replacement BMW X5 E53 rear nearside air spring.