Left Intake Manifold Mercedes W204 OM642 Diesel V6 EGR Valve A6421402160

Left Intake Manifold Mercedes W204 OM642 Diesel V6 EGR Valve is an original component from the Intake Manifolds group, designed for V6 diesel engines. It ensures proper airflow to the cylinders and works in conjunction with the EGR (Exhaust Gas Recirculation) system, which is essential for stable engine operation and emission parameters.

Specifications and technical data

• SKU: A6420903737-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420903737
• Substitutable numbers: A6420903737, A 642 090 37 37, A6421402160, A 642 140 21 60
• Location on the vehicle: Left
• Fuel type: Diesel
• Category: Intake Manifolds

Purpose and function in the OM642 engine

The presented left intake manifold integrated with the EGR valve is a component of the air supply system in the OM642 V6 diesel engine used in Mercedes W204 class models. It is responsible for the even distribution of air to the corresponding cylinders on that side of the unit and for the controlled mixing of exhaust gases from the EGR system, which affects engine refinement, performance, and exhaust smoke levels.

Thanks to its factory design, the manifold works with the original geometry of the intake ducts, which helps maintain proper cylinder filling, stable boost pressure, and correct engine control unit operation across various load ranges.

Construction and key technical features

The Left Intake Manifold Mercedes W204 OM642 Diesel V6 EGR Valve is designed specifically for the diesel unit, meaning the duct cross-sections are adapted to the airflow characteristics of the V6 engine. The integrated EGR valve allows for precise routing of a portion of the exhaust gases back into the intake, which reduces nitrogen oxide emissions and supports compliance with environmental standards.

The positioning on the left side of the vehicle is important for installation – the manifold works with engine accessories, vacuum lines, sensors, and the control wiring on that side of the engine bay. This ensures the integrity of the intake system and facilitates easier diagnostics during servicing.

Application in diesel vehicles

The component is intended for diesel-powered engines where a solution resistant to thermal and pressure loads is required for the intake. In OM642 V6 diesel engines, a properly functioning manifold with an EGR valve influences:

• stable boost pressure and even cylinder filling,
• correct operation of the exhaust gas recirculation system,
• maintenance of proper combustion parameters across the full RPM range,
• reduction of the risk of limp mode related to intake area errors.

Choosing an original manifold from this group allows for the preservation of factory flow characteristics, which is particularly important in modern diesel units with advanced electronic control.

Characteristics of the used component

The offered intake manifold with EGR valve comes from the secondary market, which represents a reasonable compromise between repair costs and maintaining the original design. A used component allows for an economical restoration of the intake system's efficiency while maintaining compatibility with factory engine accessories.

Before installation, standard service procedures are recommended, such as checking for leaks, verifying the operation of the EGR mechanism, and assessing the condition of the mating surfaces, in order to fully utilize the part's potential and avoid leaks in the intake system.

Comprehensive Mercedes intake system support

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 manifolds, intake duct elements, or intake housings, check the available parts in the Mercedes Intake Manifolds category.

To better understand the relationships between the intake system, exhaust gases, and modifications in the exhaust zone, it is worth consulting the guide on selecting used components – you will find practical tips in the article Performance exhaust system: used manifolds and sports catalytic converters on the road.