Mercedes W211 Secondary Air Pump Auxiliary Vacuum Smog Pump A0001403785

The Mercedes W211 Secondary Air Pump is an air intake system component responsible for assisting in the afterburning of exhaust gases in the engine. A properly functioning secondary air pump stabilizes the engine's operation when cold, reduces the emission of harmful exhaust components, and supports correct interaction with the engine control system.

Specifications and technical data

• SKU: A0001403785
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0001403785
• Substitutable numbers: A0001403785, A 000 140 37 85
• Location on the vehicle: Front
• Category: A/C Compressors & Clutches

Application and Function of the Secondary Air Pump

The Secondary Air Pump for Mercedes W211 operates at the front of the vehicle, where it injects additional air into the exhaust system during the engine warm-up phase. This allows the catalytic converter to reach its operating temperature faster, and the mixture burns more evenly.

An efficient component of this type contributes to:

• more stable engine operation during cold starts, without undesirable RPM fluctuations,
• reduced exhaust emissions during the critical engine warm-up phase,
• proper interaction with the OBD diagnostic system, which reduces the risk of emission-related error codes.

Construction, Location, and System Integration

The pump is mounted in the front section of the body, ensuring adequate cooling and easier service access. This front vehicle location promotes stable operation in various temperature conditions and facilitates inspection of hoses and connectors.

The component interacts with the vehicle's electrical and vacuum systems, as well as the engine control system. Thanks to its construction aligned with the manufacturer's solutions, the pump maintains:

• factory mounting points,
• appropriate connection port diameters,
• compatibility with factory wiring harnesses.

Characteristics of a Used Part

The offered secondary air pump is a used part, sourced from dismantling. This type of part allows for economical repair of the system without the need to invest in a new component, while maintaining original construction and fit for a specific generation of Mercedes E-Class.

Choosing a used OEM component is a beneficial solution for drivers who expect:

• preservation of the original technical specifications of the intake-exhaust system,
• reduced service costs while maintaining proper engine operation,
• consistency with the factory engine control unit software.

Benefits of Installation in a Mercedes W211

Installing a functional secondary air pump in a Mercedes W211 helps to eliminate typical symptoms of this system's failure, such as the illuminated engine warning light, emission errors, or uneven engine operation after startup. A properly selected component:

• stabilizes engine operating parameters in the first few minutes after starting,
• reduces the risk of failing the technical inspection due to exceeding emission standards,
• supports the long-term efficiency of the catalytic converter by reaching operating temperature faster.

Other Mercedes Air Conditioning Compressors and Clutches

If you are also looking for other components in the Mercedes Air Conditioning Compressors and Clutches category, check out the Mercedes Air Conditioning Compressors and Clutches available in our assortment to find complete solutions for your air conditioning and accessory drive systems.

More About Used Mercedes Parts

If you want to learn more about how to consciously choose used components for cars of this brand and how to combine savings with maintaining manufacturer standards, read the article: Used Mercedes Parts – Original Parts from Dismantling. There you will find practical tips on selecting components such as air conditioning compressors, control modules, or suspension components.