Mercedes V251 R350 CDI Diesel Engine EGR Cooler Valve A6421400975

The Mercedes V251 R350 CDI Diesel Engine EGR Cooler Valve is an original exhaust gas recirculation system component designed for diesel engines, supporting proper engine operation and emission reduction. Its factory design for the Mercedes brand ensures compatibility with other components and predictable performance under driving conditions. This is a solution for users seeking a technically matched component for their vehicle's EGR system.

Specifications and technical data

• SKU: A6421400975
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421400975
• Substitutable numbers: A6421400975, A 642 140 09 75
• Location on the vehicle: Rear
• Fuel type: Diesel
• Category: EGR Parts & Valves

Purpose and Function in the EGR System

The presented component belongs to the EGR Valves and Parts group, responsible for controlled exhaust gas recirculation in diesel engines. In conjunction with other EGR system components, it stabilizes exhaust gas temperature, helps reduce nitrogen oxides, and contributes to smooth engine operation across a wide range of loads.

Its placement at the rear of the vehicle allows for optimal routing of pipes and connections to the exhaust and exhaust gas cooling systems. This design facilitates even temperature distribution and simplifies servicing in the rear exhaust system area.

Diesel Engine Compatibility

The component is designed to work with diesel engines, meaning it is adapted to the characteristic parameters of diesel units, such as higher combustion pressures and specific exhaust gas temperatures. This allows the exhaust gas recirculation system to operate under stable conditions, and the engine control unit receives predictable exhaust flow values.

In practice, this translates to:

• more consistent torque characteristics in typical diesel RPM ranges,
• better cooperation with the factory control software,
• maintenance of compliance with the vehicle manufacturer's design specifications.

Installation and Operational Characteristics

The original design for Mercedes vehicles facilitates installation in the manufacturer-designated location, without the need for modifications to the system or custom brackets. The arrangement of spigots and connection points is adapted to the factory exhaust and cooling pipe system, which reduces service time.

As a used component, it allows for economical repair of the EGR system while maintaining the original design specifications. This solution is particularly beneficial for comprehensive exhaust and exhaust gas recirculation system servicing in high-mileage vehicles where both cost and adherence to factory configuration are important.

Benefits of Using an Original EGR Component

Using an original EGR cooler valve in the Mercedes V251 R350 CDI supports stable engine operation and proper interaction with the vehicle's diagnostic systems. The manufacturer-designed exhaust gas recirculation system is calibrated with injection, boost, and emission control maps, which reduces the risk of control unit errors and undesirable deviations in operating parameters.

For the user, this means:

• more predictable vehicle behavior in daily use,
• compliance with factory exhaust emission standards,
• easier diagnostics in case of potential future malfunctions.

Informed Choice of a Used Part and Additional Materials

Choosing a used EGR system component is not only about savings but also about real support for the circular economy and reducing workshop waste. If you want to better understand how reusing components – from engines to accessories – impacts the environment and your household budget, read the article: Circular Economy in Your Garage – How Choosing Used Dismantled Parts Truly Supports Environmental Protection and Your Wallet?

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other parts from the same group, such as valves, exhaust coolers, or recirculation pipes, check the available parts in the Mercedes EGR Valves and Parts category.

For drivers interested in a broader perspective on the market for original dismantled components, we have also prepared a practical guide to popular subassemblies – find more information in the material: Best Used Car Parts – A Guide to the Most Frequently Chosen Original Parts.