Pierburg 7.21851.31.0 Secondary Air Injection Pump

Reliable Secondary Air Injection Pump for Audi and Volkswagen

The Pierburg 7.21851.31.0 Secondary Air Injection Pump is an essential component designed to support emission control systems in select Audi and Volkswagen models. Operating electrically at 12 volts, this pump helps reduce harmful emissions by injecting air into the exhaust stream during cold starts.

• Electric operating mode for efficient performance
• Compatible with 12V electrical systems
• Technical Information Number: Si 1150-11 for reference
• Fits Audi A4, A4 Quattro, A6, A6 Quattro, S6, TT, TT Quattro
• Compatible with Volkswagen Beetle, Cabrio, Golf, Jetta, Passat

Product Details and Technical Specifications

The Pierburg 7.21851.31.0 secondary air injection pump operates on a 12-volt electric system, ensuring reliable activation during engine cold starts. This pump is part of the emission control air injection system, which injects fresh air into the exhaust manifold to promote the oxidation of unburned hydrocarbons and carbon monoxide. The Technical Information Number Si 1150-11 provides detailed reference for installation and maintenance procedures. Designed specifically for Audi and Volkswagen vehicles, this pump supports models including the Audi A4, A4 Quattro, A6, A6 Quattro, S6, TT, TT Quattro, and Volkswagen Beetle, Cabrio, Golf, Jetta, and Passat.

Common Applications and Problem Resolution

• Reduces cold start emissions by supplying additional air to the exhaust
• Prevents check engine light triggers related to secondary air injection faults
• Resolves issues with failed emission tests due to air injection system malfunctions
• Eliminates rough idling caused by improper air injection
• Addresses pump failure symptoms such as unusual noises or lack of airflow

Installation Notes and Tips

Installation of the Pierburg 7.21851.31.0 secondary air injection pump requires basic mechanical skills and familiarity with the vehicle’s emission control system. Ensure the vehicle’s battery is disconnected before installation to avoid electrical hazards. Verify compatibility with your specific Audi or Volkswagen model and engine variant. Follow the Technical Information Number Si 1150-11 guidelines for torque specifications and electrical connections. After installation, perform a system check to confirm proper pump operation and absence of diagnostic trouble codes.

Quality Assurance and Warranty Information

Manufactured by Pierburg, a recognized supplier of emission control components, this secondary air injection pump meets OEM standards for fit and function. The product undergoes rigorous quality control to ensure durability and reliable performance. Warranty coverage details should be confirmed at the point of purchase, typically including protection against manufacturing defects for a specified period.