Mercedes W164 W204 W213 OM642 Diesel Exhaust Gas Recirculation Pipe A6421402708

Mercedes W164 W204 W213 OM642 Diesel Exhaust Gas Recirculation Pipe is an exhaust system component designed for diesel engines, responsible for precisely routing exhaust gases to the EGR valve. By maintaining the factory flow geometry, it ensures stable engine operation, correct exhaust gas recirculation, and compliance with emission system requirements. This is a practical solution for users who want to restore the proper functioning of the EGR system in their Mercedes without excessive costs.

Specifications and technical data

• SKU: A6421402708
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421402708
• Substitutable numbers: A6421402708, A 642 140 27 08
• Fuel type: Diesel
• Category: EGR Parts & Valves

Function of the EGR pipe in a diesel engine

The exhaust gas recirculation pipe in a Diesel engine from the OM642 family is responsible for the tight and controlled delivery of a portion of exhaust gases from the exhaust system to the EGR valve. A properly functioning component in this section of the system:

• stabilizes the engine's operating temperature,
• reduces nitrogen oxide emissions by reintroducing exhaust gases into the combustion chamber,
• supports smooth engine operation under low and medium loads,
• reduces the risk of EGR-related errors appearing in the engine control unit.

In the event of leaks, cracks, or excessive wear of the pipe, power drops, limp mode, and unstable idle speed may occur, which is why replacing it with a functional component is crucial for maintaining the proper operation of the entire system.

Designed for Mercedes models with the OM642 engine

Mercedes W164 W204 W213 OM642 Diesel Exhaust Gas Recirculation Pipe has been designed for use in Mercedes vehicles equipped with the OM642 diesel engine. The pipe's construction is matched to the engine bay architecture of these models, allowing for proper routing, appropriate clearances from adjacent components, and a correct connection to the EGR valve and exhaust system.

Proper matching of the shape and cross-sectional flow diameter is important for:

• maintaining the correct exhaust gas pressure in the EGR circuit,
• ensuring stable engine operating parameters under various load conditions,
• reducing local thermal stresses in the area of the manifold and EGR valve.

Characteristics of the used component

The offered exhaust gas recirculation pipe is a part from the EGR valves and parts category in used condition, sourced from vehicle dismantling. This type of component allows for an economical repair of the system while maintaining the original installation specifications. A used element of this type is particularly attractive for older vehicles, where the priority is to restore system efficiency within a reasonable service budget.

Choosing an original, used EGR pipe from dismantling often means:

• maintaining factory fitment with other system components,
• no need for mounting modifications or additional alterations,
• the possibility of quick replacement in a workshop environment.

Benefits of using an original EGR pipe

Using the correct exhaust gas recirculation pipe in the EGR system translates into a number of practical operational benefits. Maintaining tightness and the correct flow cross-section helps to reduce excessive exhaust smoke and supports the proper operation of the turbocharger and the diesel particulate filter, if present in the configuration. A well-chosen element of this exhaust section also promotes stable engine operation during cold starts and city driving.

For users who want to take a conscious approach to repairs using parts from dismantling and better understand the impact of such solutions on the environment and service costs, a guide has been prepared: Circular economy in your garage – how choosing used parts from dismantling really supports environmental protection and your wallet?.

Expanding the EGR system in your Mercedes

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 hoses, connectors, or additional recirculation system pipes, check out the available parts in the Mercedes EGR valves and parts category.