Mercedes W164 W251 W639 Intake Manifold Charge Air Line Left N/S A6420902737

Mercedes W164 W251 W639 Intake Manifold Charge Air Line Left N/S is an original intake system component designed for installation on the left side of the engine in Mercedes W639 series vehicles. Thanks to the factory geometry of the intake ducts, it ensures stable cylinder filling conditions, which translates into smooth engine operation and predictable performance. This is a practical solution for users who want to restore the proper operation of the intake system while maintaining consistency with the factory Mercedes design and utilizing the original intake manifold architecture.

Specifications and technical data

• SKU: A6420902737
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420902737
• Substitutable numbers: A6420902737, A 642 090 27 37
• Location on the vehicle: Left
• Category: Intake Manifolds

Purpose and vehicle placement

The presented manifold is dedicated to installation on the left side of the engine in Mercedes W639 family models. The placement on this side of the engine is crucial for the correct routing of intake ducts, sensor positioning, and compatibility with other auxiliary components. Using the correct left intake manifold allows for maintaining proper hose routing, connection tightness, and adequate support for components cooperating with the intake system.

Technical and functional characteristics

The intake manifold in the Mercedes W639 intake system is responsible for the even distribution of air to individual cylinders, which affects engine refinement, throttle response, and combustion stability. The original design ensures:

• preservation of factory intake duct geometry,
• proper fitment to the cylinder head and engine accessories,
• the ability to use standard mounting points and seals,
• consistency with factory engine control unit maps.

As a result, replacing a damaged or leaking component with an original left intake manifold helps reduce the risk of mixture problems, power loss, or unstable idle speed.

Component condition and service application

The offered manifold belongs to the group of used OEM components, meaning it has been removed from a vehicle and is intended for further use after proper installation. This type of part is particularly attractive in situations where it is necessary to replace an intake system component while keeping service costs reasonable, and at the same time, it is important to maintain the original technical specifications of the vehicle.

Before installation, a standard service procedure is recommended, including checking the mating surfaces, verifying mounting sockets, and using new seals in accordance with the vehicle manufacturer's recommendations. This approach allows for fully utilizing the potential of the part and minimizing the risk of leaks in the intake system.

Benefits of using an original intake manifold

Using an original left intake manifold in a Mercedes W639 brings a number of practical service and operational benefits:

• Factory fitment – compatibility with the engine design and accessories, without the need for modifications.
• Stable engine operating parameters – maintaining predictable airflow in the intake system.
• Repair cost optimization – a used OEM component represents a reasonable compromise between price and quality.
• Consistency with service documentation – easier diagnostics and maintenance in the future.

For workshops and individual users, this means the possibility of performing repairs in a technically correct manner, while maintaining the parameters specified by the vehicle manufacturer.

Intake system expansion and related technical information

In the case of upgrading or repairing the intake system, it is worth looking at the entire assembly of components responsible for air and exhaust gas flow. If you are interested in a broader context of manifold operation in cars of various brands and the impact of the exhaust system on performance, you will find useful information in the article: Performance exhaust system: used manifolds and sports catalytic converters on the road. This is a practical supplement to your knowledge when planning more advanced modifications or repairs.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional manifolds, intake elements, or components cooperating with the air supply system, check the available parts in the Mercedes Intake Manifolds category.