Pierburg 7.21852.24.0 Secondary Air Injection Pump

Pierburg Secondary Air Injection Pump for BMW

The Pierburg 7.21852.24.0 is an electric secondary air injection pump for emission control systems. It supplies fresh air during cold starts to help the engine management system reduce exhaust emissions, and it is a direct-fit option for select BMW 3 Series applications.

• Electric secondary air injection pump
• 12V operating voltage
• Emission control component for cold-start air injection
• OE-style replacement for select BMW 320i, 323i, 325i, 328i, and 330i applications
• Cross-references Pierburg 7.21852.24.0 for the same application

Fitment Details

• Fits 2001-2005 BMW 320i, N/A
• Fits 2003-2005 BMW 325Ci, N/A, with OE No. 11727553056
• Fits 2003-2005 BMW 325i, N/A, with OE No. 11727553056
• Fits 2003-2005 BMW 325xi, N/A, with OE No. 11727553056
• Fits 2003-2005 BMW 330Ci, N/A, with OE No. 11727553056
• Fits 2003-2005 BMW 330i, N/A, with OE No. 11727553056
• Fits 2003-2005 BMW 330xi, N/A, with OE No. 11727553056
• Fits 2001-2002 BMW 325Ci, N/A
• Fits 2001-2002 BMW 325i, N/A
• Fits 2001-2002 BMW 325xi, N/A
• Fits 2001-2002 BMW 330Ci, N/A
• Fits 2001-2002 BMW 330i, N/A
• Fits 2001-2002 BMW 330xi, N/A
• Fits 2000 BMW 323Ci, N/A
• Fits 1999-2000 BMW 323i, N/A
• Fits 2000 BMW 328Ci, N/A
• Fits 1999-2000 BMW 328i, N/A

What This Pump Helps Address

• Secondary air injection pump failure codes
• Cold-start emissions faults
• Insufficient secondary air flow during startup
• Check engine light concerns tied to the air injection system
• BMW 3 Series emission control system performance issues

Installation Notes and Tips

Verify the OE number 11727553056 and confirm the vehicle’s model year before ordering. This pump is a 12V electric unit, so electrical connectors, relay operation, and related hoses should be inspected during diagnosis to avoid replacing the pump without addressing the root cause. For BMW 320i, 325Ci, 325i, 325xi, 330Ci, 330i, and 330xi applications, match the part number and fitment notes exactly.

Quality Assurance

Pierburg is an established OE supplier in emission control components, and this pump is built to meet the requirements of the listed BMW applications. Technical Information Number: SI 1150-11.