Mercedes W164 W203 OM642 Intake Manifold Left N/S Air Charge A6420905437

Visual condition of the part 

The product shows signs of use visible in the photos. 

Mercedes W164 W203 OM642 Intake Manifold Left N/S Air Charge is a factory-original air intake system component designed for OM642 diesel engines in Mercedes SUV and C-Class vehicles. This used intake manifold for the left side of the engine ensures precise airflow to the cylinders, which promotes stable engine operation and maintains correct combustion parameters. By retaining the original geometry of the intake channels, it provides a solid foundation for professional repairs or restoring the engine's factory performance characteristics.

Specifications and technical data

• SKU: A6420905437-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420905437
• Substitutable numbers: A6420905437, A 642 090 54 37
• Location on the vehicle: Left
• Category: Intake Manifolds

Purpose and function in the OM642 engine

The left intake manifold in the OM642 engine is responsible for the even distribution of air to the corresponding cylinder bank on one side of the V6 unit. The proper design of the channels influences:

• stable cylinder filling across the entire RPM range,
• maintenance of proper torque at low and medium RPMs,
• correct cooperation with the turbocharging system and engine management.

In Mercedes W164 and W203 vehicles with the OM642 engine, a correctly selected left intake manifold is crucial for maintaining smooth operation, reducing smoke, and preserving factory performance.

Construction and fitment for Mercedes

The original intake manifold from this series is designed specifically for the architecture of the OM642 engine and the engine bays of the W164 and W203 models. This means:

• compliance with factory mounting points on the left side of the unit,
• proper positioning relative to the cylinder head, accessories, and vacuum lines,
• compatibility with standard intake system components.

As a result, installation is straightforward, without the need for structural modifications, and the entire intake system retains its factory rigidity and airtightness.

Benefits of using an original intake manifold

Using an original left intake manifold in the OM642 engine allows for maintaining engine parameters at the levels intended by the manufacturer. In practice, this means:

• more predictable throttle response and stable power delivery,
• easier computer diagnostics due to the preservation of standard flow characteristics,
• better cooperation with the fuel injection system and turbocharger.

For workshops specializing in the Mercedes brand, this is a solution that facilitates maintaining the consistency of the entire air intake system and reduces the risk of problems resulting from non-original replacements.

Vehicle placement and installation aspects

The presented component is intended for the left side of the engine, which is important both when selecting parts and planning service work. Correct identification of the mounting side helps avoid discrepancies when fitting to the cylinder head and engine accessories.

When replacing the intake manifold in an OM642 engine, it is recommended to:

• thoroughly clean the contact surface with the cylinder head,
• verify the condition of seals and mating components,
• check the correct connection of all lines and connectors.

Mercedes Intake Manifolds segment – selection and system expansion

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 channel elements, or components working with the air intake system, check the available parts in the Mercedes Intake Manifolds category.

Technical support and expert knowledge

For users who want to better understand the impact of gas flow elements on the performance and durability of the engine, we have prepared a guide. You can find more about the selection and operation of used exhaust and air flow system components in the article Performance exhaust system: used manifolds and sports catalytic converters on the road.