KYB SR4418 Suspension Strut and Coil Spring Assembly - Front Left

KYB Strut-Plus SR4418 Front Left

The KYB Strut-Plus SR4418 is a front left suspension strut and coil spring assembly engineered to restore ride height, steering response, and vehicle control. Built for select Lexus NX and Toyota RAV4 applications, it combines OE-style fitment with application-specific damping and a pre-assembled design for professional replacement work.

Key Features

• OE-style replacement choice for Asian vehicles
• Includes a KYB Excel-G strut with application-specific precision damping valves
• Uses a stronger steel outer shell for added structural support
• Pre-assembled for exact fitment and professional results
• Side-specific left and right design follows the vehicle manufacturer’s original layout
• Engineered to help vehicles with electronic safety systems such as ESC and ABS
• Recognized with a 2018 import aftermarket industry award

Product Details

KYB Strut-Plus SR4418 is part of the KYB Strut-Plus line, a suspension solution focused on restoring original ride characteristics after strut wear. KYB builds this assembly around an OE-restoring strut and a high-carbon steel coil spring selected for vehicle-specific corner weights and ride height targets. For drivers searching for a front left strut assembly for 2018-2021 Lexus NX300, 2015-2021 Lexus NX300h, 2015-2017 Lexus NX200t, or 2013-2018 Toyota RAV4, this part number provides a direct replacement format designed around the original suspension layout. This part cross-references Monroe Shocks & Struts (e.g., 173014, 183014) for the same application.

Common Issues This Assembly Can Address

• Excessive bouncing or reduced damping control from a worn front strut
• Uneven or low ride height caused by fatigued coil spring components
• Noisy or unstable front suspension operation
• Reduced steering precision during braking and cornering
• Suspension performance changes after original equipment wear

Installation Notes

Fits 2018-2021 Lexus NX300, front left; 2015-2021 Lexus NX300h, front left; 2013-2018 Toyota RAV4, front left; and 2015-2017 Lexus NX200t, front left. Confirm the vehicle is not equipped with electronic suspension or electronic adjustable suspension where excluded in the fitment notes. Follow the manufacturer’s instructions for replacing the suspension strut and coil spring assembly, and verify alignment after installation. SR4418 is pre-assembled, which helps streamline replacement on the specified applications.

Quality Assurance

KYB is an original equipment supplier, and the Strut-Plus line is engineered to restore handling, control, and ride height using OE-focused components and application-specific damping. The SR4418 is built to match the intended left-side suspension layout for the listed Lexus and Toyota applications.