Mercedes W164 W211 Turbo Charger Actuator Control Unit OM642 Diesel A6420905980

The Mercedes W164 OM642 Diesel Turbocharger Actuator Controller is an original turbocharger and parts component designed for the OM642 diesel engine's turbocharging system. This controller allows you to restore proper turbine operation, stabilize boost parameters, and reduce the risk of the engine entering limp mode.

Specifications and technical data

• SKU: A6420905980-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420905980
• Substitutable numbers: A6420905980, A 642 090 59 80
• Location on the vehicle: Front
• Fuel type: Diesel
• Category: Turbos & Parts

Purpose and function of the turbocharger actuator controller

The turbocharger actuator for the Mercedes W164 with the OM642 engine is responsible for precisely controlling the turbine geometry in a diesel engine. Based on signals from sensors, the control unit adjusts the blade position, which translates into:

• smooth increase in boost pressure over the full rpm range,
• better throttle response at low and medium engine speeds,
• stable engine operation under load, without jerking or power drops,
• reducing smoke and improving the operating culture of the diesel unit.

An efficient actuator controller is crucial for maintaining the correct operating parameters of the turbocharger and protecting the engine against overload.

Benefits of using an original used item

The original turbocharger and parts control unit ensures compatibility with the factory specifications of the Mercedes-Benz supercharger system. Compared to cheap alternatives, using a used OEM component allows for:

• maintaining proper cooperation with the vehicle electronics and engine control software,
• restoration of factory turbine operating parameters without the need to modify the installation,
• reducing the risk of diagnostic errors and incorrect sensor readings,
• more predictable vehicle behavior across the full load range.

Used condition means that the item has been dismantled and may show signs of use, but is intended for further operation after proper installation and verification in the vehicle.

OM642 Diesel Engine Compatibility and Location

This actuator controller is designed to work with a diesel engine, ensuring it matches the torque characteristics and operating pressure range typical of diesel engines. Its location at the front of the vehicle facilitates service access, which is important for:

• diagnostics of the charging system,
• replacement or relocation of the turbocharger,
• checking the electrical installation of the controller.

This position also facilitates correct routing of the electrical harness and stable mounting in the engine compartment.

Professional installation and diagnostics

To fully utilize the potential of the turbocharger actuator controller for the Mercedes W164, installation at a specialized service center with the appropriate diagnostics is recommended. In practice, this means:

• checking the correctness of the electrical installation and ground,
• verification of the operation of the adjuster mechanism after assembly,
• error checking in the engine controller after the first start-up,
• road test to evaluate response to load and acceleration.

A correctly installed controller allows you to restore stable boost pressure, which translates into more predictable and comfortable vehicle operation.

AWD and the importance of a functioning supercharging system

Many Mercedes W164s feature four-wheel drive, where uniform torque development is particularly important. An efficient turbocharger system supports smooth drivetrain operation, which is discussed in more detail in our article comparing various AWD systems. For a deeper understanding of the relationship between engine characteristics and four-wheel drive, check out: xDrive, 4Matic, quattro, or 4Motion – a comparison of AWD systems from BMW, Mercedes, Audi, and VW .

Other turbochargers and parts for Mercedes

If you're looking for other turbochargers and parts for Mercedes, check out our store's selection. Go to the dedicated subpage to see our current offering: turbochargers and parts for Mercedes .