Mercedes W169 W245 OM640.941 140HP Engine Control ECU A6401501091 Automatic

Mercedes W169 W245 OM640.941 140HP Engine Control ECU Automatic is a factory-original module from the Electronic control modules and ECUs group, designed for use with the 140 HP OM640.941 engine unit in Mercedes A-Class W169 and B-Class W245 vehicles equipped with an automatic transmission. This solution allows for the restoration of proper powertrain operation while maintaining the original engine characteristics and automatic transmission control logic.

Specifications and technical data

• SKU: A6401501091
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6401501091
• Substitutable numbers: A6401501091, A 640 150 10 91, A 640 150 61 34, A6401506134, 0281013557, 0 281 013 557
• Gearbox type: Automatic
• Part type: Engine Control Unit (ECU)
• Category: ECUs & Computer Modules

Purpose and function of the ECU

The presented engine control unit is responsible for the comprehensive management of the 140 HP OM640.941 engine, including control of fuel injection, boost pressure, combustion parameters, and communication with the automatic transmission. Using a dedicated module for this powertrain configuration ensures consistency with the factory software and the vehicle's electrical architecture.

This component is crucial for professional engine control system repairs, especially in situations such as electronic failure, bus communication issues, or errors preventing the engine from starting. A properly selected ECU helps reduce diagnostic time and restores stable engine performance parameters.

Compatibility with automatic transmission

This ECU model is designed for vehicles with an automatic transmission, which is a critical factor when selecting parts. The module communicates with the transmission control system, exchanging data regarding load, torque, and rotational speed, ensuring that gear shifts occur smoothly and according to the manufacturer's specifications.

Selecting an ECU dedicated to the automatic version minimizes the risk of improper transmission operation, jerking during gear changes, or communication errors between modules. This is particularly important during professional repairs, where not only starting the vehicle but also maintaining driving comfort and component durability is essential.

Benefits of using an original module

Utilizing an original ECU from the Electronic control modules and ECUs family ensures compatibility with the factory electrical installation, wiring harness, and other modules in the vehicle. This facilitates configuration, adaptation, and potential coding during installation, while also reducing the risk of software compatibility issues.

Compared to universal solutions or aftermarket replacements, the original module allows for predictable engine behavior, correct injection and boost maps, and proper cooperation with safety and comfort systems. This is a practical solution for workshops specializing in the Mercedes brand and for users expecting consistency with the vehicle's factory specifications.

Application in service practice

The engine control unit in this configuration is suitable both for the typical replacement of a damaged module and for more advanced powertrain repairs in Mercedes W169 and W245 models. It can be used as a component for further configuration, data cloning, or adaptation to a specific vehicle, in accordance with procedures used in professional service centers.

Before installation, it is recommended to verify compatibility with your vehicle and prepare the appropriate diagnostic equipment for coding and adaptation. This approach allows you to fully utilize the module's potential and achieve stable, repeatable engine control system operation.

If you are planning a comprehensive repair or upgrade of your Mercedes engine area and need other components from the same group, such as engine ECUs, comfort modules, or transmission control units, check the available parts in the Mercedes Electronic control modules and ECUs category.

To deepen your knowledge regarding the operation of modern control modules, their diagnostics, and the use of salvaged parts in advanced electronic systems, it is worth reading an article describing a practical approach to repairing ECUs and multimedia systems in premium vehicles: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models.