1. Introduction
This manual provides essential instructions for the proper installation, usage, and maintenance of your WeatherTech Cargo Trunk Liner, Model 401159. This liner is specifically designed for select 2018-2022 Lexus RX and 2018-2021 Lexus RX Hybrid models, providing coverage behind the 3rd row seating.
The WeatherTech Cargo Liner is engineered from a proprietary custom-blended Thermoplastic Elastomer (TPE) material. This material is designed to be wear-resistant and maintain flexibility across various temperature extremes. Its textured finish helps to minimize cargo shifting during transit, offering protection for your vehicle's cargo area.

Image 1.1: WeatherTech Cargo Trunk Liner, Model 401159. This image displays the full view of the black cargo liner, highlighting its precise contours and grid-like textured surface designed to fit the cargo area of specified Lexus RX models.
2. Setup and Installation
The WeatherTech Cargo Trunk Liner is designed for a custom fit. Prior to installation, ensure your vehicle's cargo area is clean and free of debris.
- Verify Fitment: Confirm that the liner is compatible with your specific vehicle model and year (2018-2022 Lexus RX or 2018-2021 Lexus RX Hybrid, behind the 3rd row seating).
- Prepare Cargo Area: Remove any existing mats or items from the cargo area. Clean the surface thoroughly to ensure optimal placement.
- Position the Liner: Carefully place the WeatherTech Cargo Liner into the cargo area. Align it with the contours of your vehicle's trunk.
- Ensure Proper Seating: Press down firmly on all edges and surfaces of the liner to ensure it is fully seated and conforms to the vehicle's floor. The custom design should allow for a snug fit without gaps.

Image 2.1: Cargo Liner installed in a vehicle. This image shows the WeatherTech Cargo Liner precisely fitted into the trunk space of a vehicle, demonstrating its custom-molded shape and coverage.

Image 2.2: Close-up of the Cargo Liner installation. This detailed view highlights the snug fit of the liner against the trunk's edges and the distinct WeatherTech logo, confirming proper installation.
3. Usage Guidelines
The WeatherTech Cargo Trunk Liner is designed to protect your vehicle's cargo area from spills, dirt, and wear. Its robust construction and textured surface provide a reliable barrier for various items.
- Cargo Protection: Place items directly on the liner. The raised lip and textured pattern are designed to contain spills and prevent cargo from shifting during vehicle movement.
- Versatile Use: Suitable for transporting a wide range of items, including groceries, sports equipment, gardening supplies, construction materials, and even pets.
- Temperature Resilience: The TPE material maintains its flexibility and protective qualities in both hot and cold conditions.

Image 3.1: Cargo Liner in use with a cooler and fishing gear. This image demonstrates the liner's ability to protect the trunk floor while transporting recreational items, with the textured surface helping to stabilize the load.

Image 3.2: Cargo Liner protecting the trunk from golf equipment. The image shows a golf bag and muddy golf shoes placed on the liner, illustrating its effectiveness in containing dirt and debris.

Image 3.3: Cargo Liner used for transporting potted plants. This image highlights the liner's protective qualities when carrying items that might spill soil or water, keeping the vehicle's interior clean.

Image 3.4: Dog comfortably resting on the Cargo Liner. This image illustrates the liner's suitability for pet transport, providing a stable and easy-to-clean surface for animals.
4. Care and Maintenance
To ensure the longevity and effectiveness of your WeatherTech Cargo Trunk Liner, follow these simple cleaning and maintenance steps:
- Regular Cleaning: For light dirt and dust, simply wipe the liner with a damp cloth.
- Deep Cleaning: For heavier dirt, mud, or spills, remove the liner from the vehicle. Wash it with mild soap and water. A soft brush can be used for stubborn grime.
- Rinsing: Rinse the liner thoroughly with water to remove all soap residue.
- Drying: Allow the liner to air dry completely before placing it back into your vehicle. Avoid using harsh chemicals or abrasive cleaners, as these may damage the material.

Image 4.1: Cleaning the WeatherTech Cargo Liner. This image shows a spray bottle and a cloth on the textured surface of the liner, demonstrating the ease of cleaning the durable TPE material.

Image 4.2: Cargo Liner containing melted snow and water. This image illustrates the liner's ability to hold liquids, preventing them from reaching the vehicle's carpet, and highlighting the need for easy cleaning after such incidents.
5. Troubleshooting
WeatherTech Cargo Liners are designed for durability and a precise fit. Should you encounter any issues, consider the following:
- Improper Fit: Double-check that the liner model number (401159) matches your vehicle's make, model, and year specifications (Lexus RX/RX Hybrid 2018-2022, behind 3rd row). Ensure no obstructions are preventing the liner from seating correctly.
- Liner Deformation: In rare cases, extreme temperature changes during shipping may cause minor deformation. Placing the liner in direct sunlight for a short period or using a hairdryer on a low setting can help it regain its original shape.
- Persistent Odor: New TPE products may have a slight odor initially. This typically dissipates quickly with ventilation. Cleaning the liner as per maintenance instructions can also help.
If problems persist, please contact WeatherTech customer support for assistance.
6. Product Specifications
| Feature | Detail |
|---|---|
| Brand | WeatherTech |
| Model Number | 401159 |
| Compatible Vehicles | 2018-2022 Lexus RX, 2018-2021 Lexus RX Hybrid |
| Coverage Area | Behind 3rd Row Seating |
| Color | Black |
| Material | Proprietary Custom Blended TPE |
| Item Weight | 11 pounds |
| Product Dimensions | 48 x 9 x 9 inches |
| Manufacturing Origin | Made in USA |
| UPC | 787765397063 |
7. Warranty and Support
For specific warranty information regarding your WeatherTech Cargo Trunk Liner, please refer to the documentation included with your purchase or visit the official WeatherTech website. WeatherTech products are known for their quality and craftsmanship.
If you require further assistance, have questions about installation, or need to report an issue, please contact WeatherTech customer support directly. Contact information can typically be found on the manufacturer's website or product packaging.