KYB SR4131 Suspension Strut and Coil Spring Assembly - Front Left

KYB Strut-Plus SR4131 Overview

KYB Strut-Plus SR4131 is a front left suspension strut and coil spring assembly engineered for select Toyota applications. It combines an OE-restoring KYB strut with a vehicle-specific coil spring to help return ride height, steering response, and road control to factory specifications.

Fits 2003-2009 Toyota 4Runner, front left. Fits 2007-2009 Toyota FJ Cruiser, front left. This assembly is built for vehicles with electronic safety systems and is designed around the original side-specific layout the manufacturer used.

Key Features

• OE-style replacement choice for Asian vehicles
• Includes a KYB Excel-G strut with application-specific damping valves
• Uses a stronger steel outer shell for added structural support
• High-carbon steel coil spring is matched to vehicle corner weight and ride height targets
• Pre-assembled for exact fitment and professional installation results
• Left-side, side-specific design follows the vehicle manufacturer’s original configuration
• Engineered to work with electronic safety systems such as ESC and ABS
• Assembled in the USA
• Recipient of a 2018 industry award in the import aftermarket category

Product Details

KYB developed the Strut-Plus line to restore handling and control by pairing a restoring strut with a spring selected for the application. For the Toyota 4Runner and Toyota FJ Cruiser, SR4131 is built as a front left assembly that supports ride height, steering pivot function, and suspension stability. The part number SR4131 is a direct fit solution for drivers replacing a worn front strut and spring assembly on the listed vehicles, including 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser.

This part cross-references Monroe Shocks & Struts (e.g., 171352R) for the same application.

Common Problems This Part Can Address

• Front-end sag or reduced ride height on the left side
• Excessive bounce, body movement, or poor damping response
• Loose or imprecise steering feel from a worn strut assembly
• Uneven stance caused by a fatigued coil spring
• Suspension wear that can affect ESC, ABS, and related safety system performance

Installation Notes

Install SR4131 on the front left position only and follow the vehicle manufacturer’s service instructions. Confirm the vehicle is not equipped with X-Reas or adjustable suspension on 2003-2009 Toyota 4Runner applications before ordering. Because this is a pre-assembled strut and coil spring assembly, it is intended to simplify replacement of the complete front corner suspension unit.

Quality Assurance

KYB is an original equipment supplier, and the Strut-Plus line is engineered to restore OE ride height, handling, and control characteristics using application-specific components. The design also accounts for vehicles equipped with electronic safety systems.