Dorman 911-645 Secondary Air Injection Check Valve

Reliable Secondary Air Injection Check Valve for Lexus and Toyota

The Dorman 911-645 Secondary Air Injection Check Valve is engineered to maintain proper air flow in the emission control system of select Lexus and Toyota models. Designed with durable cast aluminum and a diaphragm valve type, this component supports efficient emission reduction and engine performance.

• Constructed from cast aluminum for strength and durability
• Black and silver finish for corrosion resistance
• Inlet size: 0.4 inches; outlet size: 0.47 inches
• Maximum pressure rating of 50 psi
• Operates effectively within a temperature range of -40°C to 125°C
• Includes one secondary air injection check valve, hardware, and gaskets
• Diaphragm valve type ensures reliable one-way air flow

Durable Design and Precise Fitment

This secondary air injection check valve is specifically compatible with Lexus 4Runner, GX470, Land Cruiser, LX470, and Toyota Sequoia and Tundra models. The valve’s cast aluminum construction offers resistance to heat and corrosion, while the diaphragm valve design prevents backflow, ensuring the air injection system functions correctly. The inlet and outlet sizes are optimized for these vehicle applications, supporting consistent air flow and emission control.

Purpose and Common Issues Addressed

• Prevents exhaust gases from flowing back into the air injection system
• Maintains proper air flow to reduce harmful emissions
• Helps avoid check engine light triggers related to air injection faults
• Supports smooth engine operation by ensuring correct air injection timing
• Reduces risk of damage to secondary air injection components

Installation Notes and Tips

Installation of the Dorman 911-645 check valve requires basic mechanical skills and appropriate tools. Ensure the engine is cool before beginning work. Remove the old valve carefully to avoid damage to surrounding components. Use the included hardware and gaskets to secure the new valve and prevent leaks. Verify proper orientation of the valve to maintain correct air flow direction. After installation, clear any diagnostic trouble codes and perform a system check.

Quality Assurance and Warranty

Dorman manufactures this secondary air injection check valve to meet or exceed OEM specifications for fit, form, and function. The cast aluminum material and diaphragm valve design contribute to long service life under normal operating conditions. This part is backed by Dorman’s standard warranty, providing coverage against defects in material and workmanship.