Pierburg 7.04389.00.0 Secondary Air Injection Pump

Pierburg Secondary Air Injection Pump for Mercedes-Benz

Pierburg 7.04389.00.0 is a 12V electric secondary air injection pump built as a standard replacement for Mercedes-Benz emission control systems. It pushes fresh air into the exhaust during cold starts to help reduce emissions and support smooth engine operation.

Brand Line: Genuine OE from HELLA indicates an OE-focused product line for drivers who want factory-style fit and function in emission control repairs.

Key Features

• 12V electric secondary air injection pump
• Standard replacement grade for emission control service
• Helps deliver fresh air to the exhaust on cold starts
• OE-level fitment focus for Mercedes-Benz applications
• Technical Information Number: SI 1150-11
• Part number: 7.04389.00.0

Detailed Description

This Pierburg secondary air injection pump is engineered for Mercedes-Benz vehicles that rely on an electric air injection system to reduce cold-start emissions. It is a direct-fit style replacement for many V8 and V6 models, including Mercedes-Benz G500, ML500, R500, CL500, CLK500, CLS500, E500, S430, S500, SL500, C240, C320, CLK320, E320, ML350, G55 AMG, SLK320, CLK430, ML320, ML55 AMG, CL55 AMG, CLK55 AMG, E430, E55 AMG, S55 AMG, ML430, C280, and C43 AMG.

This part cross-references Bosch 9605 for the same application. The part number 7.04389.00.0 is also listed with OE-style interchange references for select Mercedes-Benz air injection pump applications.

What It Is Used For

• Reduced cold-start emissions from a failing secondary air system
• Air injection pump noise or electrical failure
• Check engine light related to secondary air flow faults
• Insufficient fresh-air delivery into the exhaust during startup
• Emission inspection issues tied to air injection performance

Installation Notes and Tips

Confirm 12V electric system requirements and match the OE number before ordering. Verify the vehicle’s secondary air injection plumbing, electrical connector, and mounting points during diagnosis, especially on Mercedes-Benz G500, ML500, and E500 applications where multiple emission-control components may be involved. Use the vehicle’s VIN and OE reference A0001403785 when checking fitment for the 7.04389.00.0 pump.

Quality Assurance

Pierburg is supplied as Genuine OE from HELLA, with a focus on OE-level performance and factory-style replacement fitment for emission control repairs.