FCS Q4003 Air Suspension Spring - Rear

FCS Q4003 Rear Air Suspension Spring

FCS Q4003 is a rear air suspension spring for select BMW X5 and BMW X6 applications. It is built for drivers replacing a worn or leaking rear air spring on vehicles with factory air suspension.

Key Features

• Rear air suspension spring for BMW X5 and BMW X6
• Direct-fit application coverage for select 2007-2018 BMW X5 and 2008-2019 BMW X6 models
• FCS brand line replacement part
• Part number Q4003 for catalog and service matching

Fitment

• Fits 2008-2019 BMW X6, rear
• Fits 2007-2018 BMW X5, rear

Detailed Description

FCS Q4003 is an air suspension spring intended for the rear suspension on compatible BMW X5 and BMW X6 vehicles. This part number is listed for 2007-2018 BMW X5 rear applications and 2008-2019 BMW X6 rear applications, making it a focused replacement choice when servicing the factory air spring system. If you are searching for a rear air suspension spring for BMW X5 or BMW X6, Q4003 is the catalog reference to use.

The FCS line identifies this replacement under the FCS brand line, and the part is positioned for rear suspension service rather than front-end use. For buyers comparing BMW X5 rear air spring and BMW X6 rear air suspension spring options, Q4003 provides a direct application match by year, model, and position.

What It Helps Address

• Rear ride height that has dropped on one side or both sides
• Air suspension leaks from a worn spring assembly
• Uneven rear stance on BMW X5 or BMW X6 models
• Suspension warning messages related to rear air support
• Loss of rear suspension air retention over time

Installation Notes and Tips

Confirm the vehicle’s rear suspension configuration before ordering and match the part number Q4003 to the exact year, model, and position listed above. Inspect related air suspension components, lines, and fittings during service so the replacement can be verified after installation.

Quality Assurance

FCS supplies this part as a cataloged replacement air suspension spring for the listed BMW applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.