Standard Ignition AV78 Secondary Air Injection Pump Check Valve

Secondary Air Injection Check Valve for Mercedes-Benz

Standard Ignition AV78 is an O.E. Exact secondary air injection pump check valve with a 22 mm hose size. It is built for direct replacement use on select Mercedes-Benz air cleaner check valve applications, including C300, E350, ML350, and GL450 models.

Key Features

• O.E. Exact grade type for factory-style fit and function
• 22 mm hose size for the specified air injection connection
• Secondary air injection pump check valve design
• Direct replacement for select Mercedes-Benz air cleaner check valve applications
• Standard Ignition AV78 part number for catalog matching

Detailed Description

Standard Ignition AV78 is a secondary air injection pump check valve used in emission control systems on select Mercedes-Benz vehicles. This valve helps control airflow in the air injection circuit, supporting proper system operation during cold-start emissions management. It is listed as an O.E. Exact replacement and uses a 22 mm hose size, making it a practical match for vehicles such as the Mercedes-Benz C300, E350, and ML350. The AV78 cross-references Genuine 0021407460 for the same application.

What It Helps Address

• Secondary air injection fault codes related to check valve performance
• Air leakage in the air cleaner or air injection circuit
• Emissions system warnings on Mercedes-Benz C300, E350, and GL450 applications
• Cold-start air injection flow issues caused by a worn or sticking valve
• Replacement needs for an OE-style Mercedes-Benz air injection check valve

Installation Notes and Fitment

Compatible With select Mercedes-Benz air cleaner check valve applications. Fits 2008-2012 Mercedes-Benz C300, N/A; Fits 2006-2012 Mercedes-Benz C350, N/A; Fits 2006-2011 Mercedes-Benz E350, N/A; Fits 2007-2012 Mercedes-Benz GL450, N/A; Fits 2006-2011 Mercedes-Benz ML350, N/A; Fits 2007-2011 Mercedes-Benz S550, N/A; Fits 2005-2011 Mercedes-Benz SLK350, N/A; Fits 2006-2007 Mercedes-Benz C230, N/A; Fits 2006-2007 Mercedes-Benz C280, N/A; Fits 2006 Mercedes-Benz C55 AMG, N/A; Fits 2006 Mercedes-Benz CLK500, N/A; Fits 2006 Mercedes-Benz CLK55 AMG, N/A; Fits 2006 Mercedes-Benz E55 AMG, N/A. Verify hose diameter and OE reference before installation. Professional installation is recommended for emission control components.

Quality Assurance

Standard Ignition supplies OE-style replacement parts for emission control service, and AV78 is cataloged as an O.E. Exact component for the listed Mercedes-Benz applications.