KYB SR4178 Suspension Strut and Coil Spring Assembly - Front Left

KYB Strut-Plus SR4178 Front Left

KYB Strut-Plus SR4178 is a front left suspension strut and coil spring assembly for select Toyota Sienna models. It combines an OE-restoring KYB strut with a vehicle-specific coil spring to help return ride height, handling, and steering response to factory specifications.

Key Features

• Recommended OE-style replacement choice for Asian vehicles
• Includes a KYB Excel-G strut, stronger steel outer shell, and application-specific damping valves
• Pre-assembled for exact fitment and professional results
• Side-specific design with left and right part numbers, as the vehicle manufacturer intended
• Engineered to help vehicles 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 Strut-Plus SR4178 is built for drivers who need a direct replacement for the front left suspension on a 2004 Toyota Sienna or 2005-2006 Toyota Sienna, front left. KYB develops the spring and damping components around vehicle attributes and corner weights so the assembly restores ride height within OE specifications. This part cross-references Monroe Shocks & Struts (e.g., 172237, 182237) for the same application.

The KYB Strut-Plus line focuses on complete suspension restoration rather than piecing together separate components. For Toyota Sienna applications, that means a matched strut and coil spring assembly engineered to support stable handling, consistent steering feel, and proper suspension geometry.

What It Helps Address

• Front-end sag or uneven ride height
• Worn strut damping that affects ride control
• Excessive body motion over bumps and turns
• Steering response that feels loose or inconsistent
• Suspension wear that can affect ESC, ABS, and related systems

Installation Notes

Fits 2004 Toyota Sienna, front left, and fits 2005-2006 Toyota Sienna, front left. Follow the vehicle manufacturer’s service procedures for strut and spring replacement. Verify side-specific placement before installation, and confirm the application matches 7-passenger seating notes where listed for the 2005-2006 Toyota Sienna.

Quality Assurance

KYB is an original equipment supplier, and the Strut-Plus SR4178 is engineered to restore handling and control with OE-focused fit and damping characteristics. The assembly is pre-assembled for professional installation and built with application-specific components for the listed Toyota Sienna fitments.