Mercedes W169 W245 A150 B150 M266.920 95HP Engine ECU Kit A2661530391 Key Lock

Mercedes W169 W245 A150 B150 M266.920 95HP Engine ECU Kit is an original electronic control module designed for M266 series powertrains in A-Class and B-Class models. This item from the Electronic control modules and ECUs category is responsible for precise engine management, ensuring stable power characteristics and proper integration with other vehicle systems. This is a solution for users looking for a proven, factory-spec ECU matched to the specific 95HP engine configuration.

Specifications and technical data

• SKU: A2661530391-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661530391
• Substitutable numbers: A2661530391, A 266 153 03 91, A0024463140, A 002 446 31 40, 5WK90974, A1695452932, A 169 545 29 32, A1695451908, A169 545 19 08
• Category: ECUs & Computer Modules

Purpose and function of the engine control unit

The engine control unit used in M266.920 units in A150 and B150 models is responsible for key processes such as fuel metering, ignition control, and coordinating engine auxiliary components. Thanks to factory calibration, the ECU works with a specific version of software and hardware, which allows for maintaining the correct operating parameters of the powertrain and compliance with factory emission standards.

In case of starting issues, rough idling, or communication errors in the vehicle network, replacing it with the correct control unit dedicated to this engine version is often the most effective service solution. Selecting an ECU compatible with the specific Mercedes configuration minimizes the risk of adaptation problems and allows for the efficient restoration of full powertrain functionality.

Benefits of using an original ECU module

Choosing an original engine control unit for a Mercedes A-Class and B-Class with the M266.920 unit provides a number of practical benefits:

• maintaining factory engine control logic and compatibility with the vehicle's electrical system,
• proper cooperation with safety and comfort systems that communicate with the ECU,
• possibility of diagnostics and programming using standard service tools designed for the Mercedes brand,
• reducing the risk of errors resulting from the use of an unsuitable or universal control unit.

For workshops and private users, this means a more predictable installation and configuration process. A properly selected engine control unit also facilitates subsequent maintenance, as the engine's operating parameters remain consistent with the manufacturer's documentation.

Product characteristics and service application

The presented control unit belongs to the Electronic control modules and ECUs group, which means it is a component directly responsible for processing signals from sensors and controlling engine actuators. In practice, this affects:

• idle speed stability and throttle response,
• fuel consumption in typical urban and extra-urban driving conditions,
• proper operation of systems related to the engine (e.g., traction control systems, if they communicate with the ECU),
• recording and transmitting fault codes to the vehicle's diagnostic system.

Due to its factory design for specific versions of the Mercedes W169 and W245, this module is particularly useful for repairs where maintaining the original vehicle configuration is required, without interfering with electrical wiring or mechanical adaptations.

Product condition and installation aspects

The offered control unit is in used condition, which in practice means it has been removed from a vehicle and verified for further use. This type of solution is often chosen by workshops and users who want to optimize repair costs while maintaining the original part specifications. Before installation, standard service procedures should be taken into account, such as potential coding, matching to the immobilizer, or adaptation to a specific vehicle according to the manufacturer's guidelines.

Due to the nature of automotive electronics, installation by a specialized service center equipped with appropriate diagnostic software is recommended. Correct coding of the control unit has a direct impact on proper engine operation and the absence of errors in onboard systems.

More information about used Mercedes electronics

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 additional ECU controllers, engine management modules, or electronic auxiliary control units, check out the available parts in the Electronic control modules and ECUs Mercedes category.

Before deciding to purchase a used engine control unit, it is worth familiarizing yourself with practical tips regarding the selection and verification of such components. A detailed discussion of the topic can be found in the article The second life of electronics – when is it worth choosing used engine ECUs, comfort modules, and parking sensors?, which describes, among other things, what to look for when choosing an ECU and how to safely use the used parts market.