Dorman 911-988 Secondary Air Injection Check Valve - Left

Reliable Secondary Air Injection Check Valve for Audi and Volkswagen

The Dorman 911-988 Secondary Air Injection Check Valve is engineered to maintain optimal emission control in select Audi and Volkswagen models. Crafted from durable cast aluminum, this valve ensures consistent performance within a wide temperature range, supporting your vehicle's air injection system effectively.

• Constructed from cast aluminum for durability and corrosion resistance
• Measures 4.5 inches in length with a natural finish
• Features a diaphragm valve type for reliable operation
• Includes three ports with inlet size of 0.563 inches and outlet size of 0.5 inches
• Maximum pressure rating of 5 psi suitable for emission control systems
• Designed to operate between -40°C and 125°C
• Comes with one secondary air injection check valve and one gasket
• Thread and mounting hole diameters both 6 mm for secure installation

Product Details and Specifications

The Dorman 911-988 secondary air injection check valve is designed specifically for emission control systems in Audi and Volkswagen vehicles, including models such as the A4, A5, A6, A7, A8, Q5, Q7, S4, S5, S6, S8, SQ5, and Touareg. Its cast aluminum construction provides strength and resistance to corrosion, while the diaphragm valve type ensures precise control of air flow. The valve’s three ports accommodate the necessary connections with inlet and outlet sizes optimized for efficient air injection. With a maximum pressure rating of 5 psi and a working temperature range from -40°C to 125°C, this valve is built to withstand demanding engine environments.

Common Applications and Problem Resolution

• Prevents backflow in the secondary air injection system to maintain emission standards
• Helps reduce engine misfires caused by faulty air injection valves
• Addresses check engine light issues related to air injection system failures
• Improves cold start emissions by ensuring proper air flow
• Supports overall emission control system functionality in Audi and Volkswagen vehicles

Installation Notes and Tips

When installing the Dorman 911-988 secondary air injection check valve, ensure all connections are clean and free of debris. Verify that the gasket is properly seated to prevent leaks. The valve is not adjustable, so correct alignment during installation is critical. Use appropriate tools to secure the valve using the 6 mm thread and mounting hole diameters. Always consult the vehicle’s service manual for specific installation procedures related to your Audi or Volkswagen model.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, providing reliable performance and durability. The 911-988 secondary air injection check valve undergoes rigorous quality control to ensure it functions correctly within the specified pressure and temperature ranges. Please refer to Dorman’s warranty policy for detailed coverage information.