FCS Q4015 Air Suspension Spring - Rear Left

Rear Left Air Suspension Spring for Mercedes-Benz

FCS Q4015 is a rear left air suspension spring for select Mercedes-Benz models equipped with AIRMATIC. It is built for direct replacement use on the rear left corner and supports the suspension setup found on specific C-Class and E-Class applications.

Key Features

• Air suspension spring for the rear left position
• Fits Mercedes-Benz models with AIRMATIC where listed
• Application-specific replacement for OE-style suspension service
• FCS brand line part: Q4015
• Fits 2015-2021 Mercedes-Benz C300, rear left, with AIRMATIC; FCS
• Fits 2019-2021 Mercedes-Benz E450, rear left; FCS
• Fits 2018-2021 Mercedes-Benz E63 AMG S, rear left; FCS
• Fits 2016-2018 Mercedes-Benz C350e, rear left, with AIRMATIC; FCS
• Fits 2017-2018 Mercedes-Benz E400, rear left; FCS
• Fits 2015 Mercedes-Benz C400, rear left, with AIRMATIC; FCS

Detailed Description

FCS Q4015 is an air suspension spring for the rear left side on select Mercedes-Benz vehicles. It serves the suspension system on C300, E450, E63 AMG S, C350e, E400, and C400 applications listed above, including models equipped with AIRMATIC where noted. This part number, Q4015, is the correct reference to verify before ordering for a Mercedes-Benz C300 or E-Class rear left suspension repair.

The FCS line identifies this as a suspension replacement part for the specified vehicle positions and fitment. Use it when servicing a rear left air spring on the listed Mercedes-Benz C300 and E-Class applications.

What It Helps Fix

• Rear corner sagging from a worn air spring
• Uneven ride height at the left rear
• Air suspension leaks at the spring assembly
• Ride quality issues caused by a failed rear air spring
• Suspension warning concerns tied to rear air support loss

Installation Notes and Tips

Confirm the vehicle year, model, and rear left position before installation. Verify whether the vehicle is equipped with AIRMATIC where required by fitment. Compare the original part number and suspension configuration to Q4015 before service. Professional installation is recommended for air suspension components.

Quality Assurance

FCS Q4015 is cataloged for the exact Mercedes-Benz applications listed in the fitment data, including 2015-2021 Mercedes-Benz C300 rear left and 2019-2021 Mercedes-Benz E450 rear left. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.