Mercedes W164 W211 EGR Exhaust Gas Valve OM629 V8 Diesel A6291400408

Mercedes W164 W211 EGR Exhaust Gas Valve OM629 V8 Diesel is an exhaust gas recirculation system component designed for V8 diesel engines used in Mercedes W164 and W211 class models. It is responsible for precise control of exhaust gas flow, which affects the engine's operating culture, emission levels, and engine parameter stability. By maintaining the factory design, this EGR valve allows for a technically correct repair of the intake system without interfering with the original engine architecture.

Specifications and technical data

• SKU: A6291400408-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6291400408
• Substitutable numbers: A6291400408, A 629 140 04 08
• Fuel type: Diesel
• Part type: EGR Tube
• Category: EGR Parts & Valves

Function and role of the EGR valve in the OM629 V8 Diesel engine

The EGR valve in the OM629 engine is responsible for the controlled supply of exhaust gases to the intake manifold, which helps lower combustion temperatures and reduce nitrogen oxide emissions. In V8 Diesel units, the use of a properly selected EGR valve is particularly important due to high thermal and pressure loads. A properly functioning component from the EGR valves and parts group supports stable idle speed, improves throttle response, and helps maintain smooth operation across all cylinders.

Compatibility with Mercedes W164 and W211

The presented valve has been designed for use in Mercedes W164 and W211 series vehicles equipped with a V8 diesel engine. This ensures the correct geometry, mounting points, and flow characteristics, which facilitates installation in place of the factory component. Using the original design helps avoid issues with fitment, leaks, or engine control unit errors resulting from incorrect exhaust flow parameters.

Benefits of using an original used EGR valve

Choosing an original, used EGR valve for a diesel engine is a solution that allows you to balance cost control with compliance with the manufacturer's factory specifications. A component sourced from dismantling the same family of power units:

• maintains the factory operating characteristics of the exhaust gas recirculation system,
• reduces the risk of adaptation problems in the engine control unit,
• allows for maintaining the structural consistency of the entire intake system. For many users, it is also important that the use of original components can positively influence the perceived value of the vehicle upon resale. If you want to better understand how the selection of dismantled parts affects the subsequent valuation of a car, it is worth reading the article Original used parts and resale value – how not to lose money?.

Intended for diesel engines

This EGR valve is designed for systems powered by Diesel fuel, which is crucial for proper cooperation with injection maps, boost pressure, and the control unit's operating strategy in V8 units. The construction adapted to the specifics of diesel engines ensures adequate resistance to soot contamination and high exhaust temperatures, which translates into operational stability in the long term.

Application area and expansion of the EGR system in Mercedes

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 recirculation pipes, exhaust gas coolers, or additional control components, check the available parts in the Mercedes EGR valves and parts category.