Product Overview

The secondary air injection pump, OEM number A0001405185, is fitted across an unusually wide range of Mercedes-Benz models with the M272 and M273 engine family, including the C230, C280, C300, C350, CL550, CLK350, CLS550, E350, E550, GL450, GL550, GLK350, ML350, R350, S400, SL550, SLK300, and SLK350, spanning model years 2005-2015. Since this pump covers such an enormous range of Mercedes sedans, coupes, and SUVs, it's a genuinely high-turnover part for anyone stocking Mercedes emissions system components.

Worn or failing units typically show up as a check engine light with a secondary air system fault code, engine stalling, poor acceleration, or a rattling or grinding noise from the pump during cold starts. GSK Auto manufactures this pump to OEM specification at our Ningbo, China facility, with every unit tested before packing. We supply at wholesale volume with low MOQ and support private label packaging, with our team available to confirm fitment before shipping.

Replacement OEM Numbers

Cross-Reference OEM Number

0001405185, 0001404685, 704389020

(Confirm against your VIN or chassis code before ordering - this pump spans an unusually wide range of Mercedes models and body styles across the M272/M273 engine family, so it's worth double-checking the exact chassis and engine before ordering at volume.)

What Is a Secondary Air Injection Pump?

Function: The secondary air injection pump pushes additional fresh air into the exhaust system during cold starts, helping the catalytic converter reach operating temperature faster and reducing cold-start emissions.

Working Principle: An electric motor drives the pump to push fresh air through a dedicated line into the exhaust manifold during the first minute or two after a cold start, promoting more complete combustion of unburned fuel and helping the catalytic converter light off sooner, after which the system shuts off for the rest of the drive cycle.

Importance: This pump only runs briefly on cold starts, but a failing unit can trigger emissions-related fault codes and cause the vehicle to run slightly richer or produce higher cold-start emissions until the catalytic converter reaches temperature.

Common Failures & Signs: Internal motor or bearing wear affecting pump operation. Check engine light with a secondary air injection system fault code. Rattling, grinding, or whining noise from the pump area during cold starts. Engine stalling or poor acceleration in more advanced failure cases.

Key Features

OEM-standard fitment - matches factory pump output and mounting configuration for the A0001405185 application.

Precision manufacturing - ABS material construction resists heat, pressure, and engine bay conditions.

Long service life - built to handle repeated cold-start cycles over the vehicle's service life.

Excellent fitment - direct bolt-in replacement, no modification required.

Corrosion resistance - housing construction resists heat and moisture exposure.

Reliable performance - consistent air delivery matching factory specification.

Benefits

Importers - high-turnover part covering an enormous range of Mercedes sedans, coupes, and SUVs, simplifying inventory.

Wholesalers - steady demand from several of Mercedes' highest-volume platforms sharing the M272/M273 engine.

Repair Shops - OEM-spec fitment reduces comeback risk on emissions system jobs.

Distributors - private label packaging available for building a branded catalog.

End Customers - restored proper cold-start emissions function and elimination of check engine light.

Packaging & Shipping

Standard export packaging, sized for a pump component. Customized packaging available for distributor branding. OEM-style and private label printing on request. Container loading handled directly, with mixed-SKU consolidation for smaller orders. Worldwide shipping to Europe, North America, South America, the Middle East, Africa, and Southeast Asia.

Why Choose GSK Auto

GSK Auto manufactures factory-direct, keeping pricing tied to production cost. This pump is built to OEM specification and tested before packing. We support low MOQ, private label packaging, and worldwide shipping, with our technical team available to confirm fitment before you order.

Call to Action

Sourcing secondary air injection pumps for Mercedes C, E, S, CL, CLK, CLS, GL, ML, R, SL, or SLK-Class vehicles? Contact GSK Auto for a wholesale quote, catalog, or OEM/private label cooperation.