Mercedes W204 W211 Diesel OM646 Exhaust EGR Manifold Line A6461401508

Mercedes W204 W211 Diesel OM646 Exhaust EGR Manifold Line is an original exhaust gas recirculation system component designed for OM646 diesel engines. Thanks to its factory geometry and precise fit for Diesel units, it ensures proper exhaust flow between the manifold and the EGR valve, supporting stable engine operation and emission reduction.

Specifications and technical data

• SKU: A6461401508-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461401508
• Substitutable numbers: A6461401508, A 646 140 15 08
• Fuel type: Diesel
• Category: EGR Parts & Valves

Purpose and technical function

The Mercedes W204 W211 Diesel OM646 Exhaust EGR Manifold Line in the OM646 engine is responsible for the controlled transport of exhaust gases from the exhaust manifold to the recirculation system. A correctly selected component:

• maintains connection tightness in high-temperature and high-pressure areas,
• ensures stable exhaust gas flow to the EGR valve,
• supports the proper operation of the emission control system in Diesel engines,
• minimizes the risk of ECU errors related to the EGR system.

In Mercedes C-Class W204 and E-Class W211 vehicles with the OM646 unit, using the correct EGR pipe is crucial for maintaining smooth engine operation, correct air and exhaust gas dosage, and compliance with emission standards.

Benefits of using an original component

The original line from the EGR valves and parts group ensures:

• precise fitment to the exhaust and intake system in the OM646 engine,
• appropriate diameter and cross-section shape, which limits pressure drops and turbulence,
• compatibility with factory mounts and accessories in the engine bay,
• consistency with engine control maps designed for the EGR system in the Diesel version.

As a result, replacing a worn or leaking line with an original component allows for the restoration of correct exhaust gas recirculation system parameters without the need for additional modifications.

Condition, installation, and service application

The item comes from a used vehicle and is offered as a used part, which provides a reasonable compromise between repair costs and maintaining original technical specifications. This type of EGR line is particularly useful for:

• eliminating leaks in the area where the manifold connects to the EGR valve,
• repairs after pipe cracking or deformation caused by overheating,
• restoring EGR system efficiency after long-term carbon deposit buildup,
• preventive maintenance in high-mileage vehicles.

Due to the factory fitment for OM646 diesel units in Mercedes W204 and W211 models, installation is performed using standard mounting points, which facilitates workshop work and reduces vehicle downtime.

EGR system expansion in 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 lines, pipes, or valve bodies, check out the available parts in the Mercedes EGR valves and parts category.

Repairs and tuning with used components

Using verified, used EGR system components is an effective way to reduce service costs while maintaining high quality and compliance with the factory design. For tuning projects or budget repairs, it is worth learning about the broader context of using second-hand parts – from intake systems to engine accessories. You can find more practical tips in the article Audi on second-hand parts – tuning and repairs without losing quality, which shows how to consciously choose used components for German brand vehicles.