Lexus IS300 Suspension Strut & Shock Absorber Replacement Guide (2016-2018)
Restore your Lexus's sharp handling and smooth ride with the right replacement parts.
- The correct model years are 2016-2018 for the third-generation IS300.
- Check if your car has standard suspension or electronic AVS (common on F-Sport) before buying parts.
- KYB is a respected aftermarket brand that offers an OEM-quality, slightly firmer ride compared to stock.
- A four-wheel alignment is mandatory after replacing front struts to prevent tire wear and handling issues.
Is Your Lexus Ride Not What It Used to Be?
The third-generation Lexus IS300 is known for its precise handling and comfortable ride. As the miles add up, usually over 80,000, the original shocks and struts wear out. This happens gradually, so you might not notice it at first. But worn shocks can affect both safety and performance. Replacing them can bring back the car's original feel.
Symptoms of Failing Shocks and Struts
If you notice any of these signs, it might be time for a replacement.
- Bouncy or Floating Ride: The car continues to bounce up and down after hitting a bump.
- Nose Dive or Body Roll: The front of the car dips excessively when you brake, or the body leans more than usual in corners.
- Visible Fluid Leaks: Oily fluid leaking from the body of the shock or strut is a clear sign of failure. A 2016 IS300 with high mileage was noted to have leaking rear shocks.
- Uneven Tire Wear: Bouncing tires can wear unevenly, a condition called 'cupping'.
- Clunking Noises: Worn mounting components can cause clunking sounds when going over bumps.
A Note on F-Sport and AVS
If your IS300 is an F-Sport model, it may have Adaptive Variable Suspension (AVS). These are electronic shocks that adjust automatically. Most aftermarket options, like KYB, are passive and will not work with the AVS system. Make sure you know which suspension your car has before ordering parts.
Choosing the Right Aftermarket Part: OEM vs. Aftermarket
When it's time to replace your shocks, you have a few choices. You can go back to the dealer for Original Equipment Manufacturer (OEM) parts, or choose an aftermarket brand.
- OEM: These are the exact same parts your car came with from the factory. They guarantee the original ride quality but are the most expensive option.
- Aftermarket (KYB): For the 2016-2018 IS300, KYB is a leading aftermarket option. KYB is a Japanese company that is an OEM supplier for many car brands, including Toyota and Lexus. Their Gas-A-Just series for the IS300 is a monotube design, which is often considered a performance upgrade over the standard twin-tube shocks. They typically provide a slightly firmer, more controlled ride than the base model's original shocks.
Pro Tip: For many owners of non-AVS cars, a set of KYB shocks and struts offers a great balance of performance and value, often restoring the car's handling for less than the cost of OEM parts.
Known Issues, Recalls, and Service Bulletins
The 2016-2018 Lexus IS300 has a reliable suspension system. Searches for official recalls or Technical Service Bulletins (TSBs) from the National Highway Traffic Safety Administration (NHTSA) for suspension components on this model came up empty. The main recalls for this vehicle concern the fuel pump and airbags. While some owners report minor issues like the car pulling to one side, this is often traced to alignment rather than a failed part. The most common failure is simple wear-and-tear, such as fluid leaks from the shocks after many miles.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Parts (Front & Rear Set) | $650 - $900+ |
| New Aftermarket Parts (KYB Set) | $350 - $450 |
| Shop Labor (Front & Rear) | $300 - $450 |
| Total Professional Installation | $700 - $1,350+ |
Frequently Asked Questions
Do I need to replace all four shocks at once?
It is highly recommended to replace shocks and struts in pairs (both fronts or both rears). Replacing all four at the same time ensures balanced handling and is the best practice if they are all high-mileage and original.
What's the difference between a strut and a shock?
A shock absorber simply dampens suspension movement. A strut is a structural part of the suspension that also includes the spring mount and affects steering alignment. Your IS300 has strut-like assemblies in the front and separate shocks and springs in the rear. Many people and part suppliers use the terms interchangeably for the front units.
Will KYB shocks make my ride harsh?
The KYB Gas-A-Just series is a monotube shock that provides a firmer, more controlled ride than the stock units. Most drivers describe it as sporty and responsive, not harsh. If you prefer the softer, original base-model ride, OEM parts might be a better choice.
Do I need a wheel alignment after replacing my struts?
Yes. Replacing the front struts will change your vehicle's alignment angles. A four-wheel alignment is required after the job is done to ensure proper handling and prevent premature tire wear.
Technical Specifications
OEM Part Numbers: 48510-80847 48520-80576 48530-80854 48530-80847
The front suspension is a double-wishbone design using coil-over-shock assemblies (struts). The rear is a multi-link design with separate shock absorbers and coil springs. Aftermarket options like the KYB Gas-A-Just are typically high-pressure monotube designs.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lexus IS300: