Mercedes W164 R170 W221 Secondary Air Pump Injection A0001404385

Mercedes W164 R170 W221 Secondary Air Pump Injection is a specialized component of the air supply system used in M271 series gasoline engines. It is responsible for stable secondary air injection during the engine start-up and warm-up phase, supporting the reduction of exhaust emissions and improving engine performance. This used, original pump provides a functional service solution for Mercedes W209 and W212 class models.

Specifications and technical data

• SKU: A0001404385
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0001404385
• Substitutable numbers: A0001404385, A 000 140 43 85, 0580000021, 0 580 000 021
• Category: Secondary Air & Smog Pumps

Purpose and function in the engine system

The secondary air injection pump from this offer is designed for use in Mercedes vehicles with the M271 engine, particularly in W209 and W212 bodies. This component works with the exhaust system and the engine control unit, supplying additional air to the exhaust gases at the critical moment after the engine is started.

Thanks to this solution, it is possible to reach optimal catalytic converter operating parameters faster, which translates into more stable cold engine operation and a reduction in harmful exhaust emissions. For the user, this means smoother starting and more consistent engine operation in the first minutes after start-up.

Construction and technical characteristics

The pump belongs to the group of components known as Secondary air pumps. It is an electric auxiliary device that operates in a mode activated by the engine control unit, without driver intervention. The design is based on a compact housing integrated with an electric drive, which facilitates installation in the engine compartment and ensures proper mounting rigidity.

The original design for the Mercedes brand guarantees a proper fit to factory brackets, air hoses, and the electrical harness. As a result, the pump can be installed as a direct replacement for the factory component, without the need for installation modifications or the use of additional adapters.

Service application and installation benefits

A functional secondary air pump is essential for the proper operation of the exhaust gas purification system and for engine operation during the warm-up phase. Its failure can result in error codes in the control unit, the check engine light coming on, and problems with passing exhaust emission tests.

Replacing a worn component with the offered pump allows you to:

• restore the proper operation of the secondary air system in the M271 engine,
• reduce the risk of diagnostic errors related to exhaust emissions,
• maintain vehicle compliance with environmental requirements and emission regulations,
• maintain consistency with the factory configuration of the Mercedes W209 / W212 vehicle.

For workshops and individual users, this means effectively restoring full system functionality while maintaining reasonable service costs.

Product condition and installation aspects

The offered secondary air injection pump is a used component, which allows for economical vehicle repair while maintaining the manufacturer's original specifications. Before installation, it is recommended to perform a standard verification of the electrical installation, air hoses, and mounting points to ensure the entire system works correctly after replacement.

Due to the nature of its operation in the engine compartment, it is particularly important to correctly connect the electrical connectors and ensure the air hoses are seated tightly. A properly installed pump works with the factory engine control unit, activating automatically under the appropriate engine operating conditions.

System expansion and selection of related parts

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional pumps, control valves, or air hoses, check out the available parts in the Mercedes Secondary Air Pumps category.

When planning broader service work or engine upgrades, it is also worth expanding your knowledge about the characteristics of different engines and their maintenance costs. For this purpose, an article comparing popular BMW diesel units – BMW N47 vs M57 / M57N / M57N2 – a ranking of legendary diesels – may be helpful, as it shows how choosing the right parts from the secondary market affects operating economy.

Summary

Mercedes W164 R170 W221 Secondary Air Pump Injection is an original, used secondary air system component designed for M271 engines in Mercedes W209 and W212 models. It ensures proper secondary air supply during the start-up phase, supporting the exhaust system and reducing exhaust emissions. It is a practical service solution for users and workshops that want to restore full system functionality while maintaining the vehicle's factory configuration.