A-Premium Secondary Air Injection Pump for Mercedes‑Benz — Direct-Fit (Black Plastic) Restores SAI, Includes Mounting Hardware

A-Premium Secondary Air Injection Pump (smog pump) is a direct-fit replacement pump engineered to restore secondary-air function and reduce exhaust emissions on compatible Mercedes‑Benz models.

When the secondary air injection (SAI) pump fails, you'll see check-engine lights, rough cold starts, and failed emissions tests. This A-Premium unit is made from corrosion-resistant plastic with robust internal components and includes mounting hardware for a straightforward swap. It matches multiple Mercedes‑Benz OEM reference numbers so you can replace a faulty pump with confidence and return the vehicle's air-injection system to proper operation.

How will this pump affect engine emissions and start-up behavior?

The secondary air pump introduces fresh air into the exhaust stream during cold start to help oxidize unburned hydrocarbons and reduce tailpipe emissions. Replacing a worn or seized pump restores that function and helps the vehicle meet emissions testing criteria. You may notice fewer misfire codes related to secondary air and smoother cold-start transitions.

• Restores fresh-air flow into exhaust manifolds during cold starts
• Reduces hydrocarbon and carbon monoxide spikes on warm-up
• Helps clear air-injection fault codes tied to a failed pump
• Supplied with mounting hardware for easier installation

Which Mercedes‑Benz models and part numbers are compatible?

This pump is designed to fit a broad range of Mercedes‑Benz V6 and V8 vehicles from the mid‑2000s through early 2010s. Compatibility covers C‑class, E‑class, S‑class, SL, SLK, CLK, CLS, ML, GL, GLK, R and G models with the listed engine sizes. Cross-reference the supplied reference numbers to ensure an exact match for your VIN and engine configuration.

• Fits Mercedes C230, C250, C280, C300, C350 (various years 2005–2012)
• Compatible with CL550, CLK350/550, CLS550/E550/S550, SL/SLK models
• Also fits ML350/450/550, GL450/550, GLK350, G550, R550 and S400/S450
• Reference numbers: 0001404685, 0001405185, 0580000025, 0580000026 and related OEM codes

What are the pump specifications and what comes in the box?

The A-Premium secondary air injection pump uses durable plastic construction with three hose ports and a single female electrical connector that has two pin terminals. It is designed to withstand engine-bay heat and corrosion while providing consistent airflow. Each unit ships with the pump and the necessary mounting hardware to simplify installation.

• Material: high‑temperature resistant plastic housing
• Electrical: one female connector, two pin terminals
• Hose fittings: three outlet/ inlet connectors for vacuum and air lines
• Package: 1 x pump plus mounting hardware included

Who is this for? If you own a compatible Mercedes‑Benz showing SAI-related trouble codes, failed emissions, or a rattling/seized air-pump, this A-Premium replacement is intended for DIY mechanics and professional technicians who need a cost-effective, OE-referenced part. It suits anyone replacing a failing smog pump to restore emissions function, pass inspections, or eliminate related dash warnings. Always verify fitment against your vehicle VIN and OEM reference numbers before purchasing.