Mercedes W169 A170 266.940 Engine Control ECU Kit A2661530791 Key Lock Automatic

ECU Engine Control Unit with Ignition Switch Set for Mercedes A-Class W169 A170 is a specialized set from the Electronic Control Modules and Controllers group, designed for vehicles with an automatic transmission and a gasoline engine. It is a practical solution for workshops and users who need a cohesive package of electronic components to manage the powertrain and the ignition lock system in an automatic version.

Specifications and technical data

• SKU: A2661530791-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661530791
• Substitutable numbers: A2661530791, A 266 153 07 91
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and Configuration of the ECU Set

The presented control set is dedicated to the Mercedes A-Class W169 generation, A170 version, with a gasoline engine and an automatic transmission. The set includes the ECU engine control module along with components related to the steering lock and ignition switch, which facilitates the adaptation of the powertrain electronics to the specific vehicle configuration without the need to source individual components from different suppliers.

Since all components come from a single vehicle, the user receives a cohesive package that minimizes the risk of communication problems between the engine control unit, immobilizer, and starting system. This is particularly important for modern electronic systems where software and configuration compatibility is crucial for the correct operation of the powertrain.

Operating Parameters – Gasoline Engine and Automatic Transmission

The set has been prepared for gasoline engines, meaning it includes appropriate control maps, ignition system logic, and compatibility with accessories characteristic of these types of units. Its application in a vehicle with an automatic transmission translates to proper handling of functions such as:

• communication with the automatic transmission control module,
• correct torque management during gear changes,
• operation of driving modes related to the transmission's function.

Such adaptation allows for stable powertrain operation, smooth gear shifting, and correct interaction with other vehicle systems, which directly impacts driving comfort and safety.

Application in Diagnostics and Repairs of Mercedes W169 A170

The ECU set with ignition switch and steering lock is particularly useful in situations where the engine control unit is damaged, there are immobilizer problems, or unsuccessful attempts at programming the electronics have been made. Using a ready-made set from a single vehicle allows for:

• reduced diagnostic and installation time compared to selecting individual modules,
• reduced risk of incompatibility between the control unit, key, and ignition switch,
• easier restoration of full functionality to the starting and engine control systems.

For workshops specializing in the Mercedes brand, this is a convenient service solution that allows for efficient handling of repairs related to powertrain electronics in the W169 A170 model.

Characteristics of a Used Product

The offered set comes from dismantling, which allows for combining an attractive purchase price with the preservation of the original manufacturer's specifications. A used control set is a good choice when repairing the factory control unit is uneconomical or impossible, and the customer expects a solution consistent with the vehicle's design. Choosing an original module from the aftermarket allows for maintaining the factory electrical system architecture and predictable behavior of electronic systems.

Related Electronic Modules and Service Knowledge

When working with powertrain electronics, it is beneficial to understand the dependencies between the engine control unit, comfort modules, and multimedia systems in various brands. For comparison of solutions used in other manufacturers and a better understanding of control modules, immobilizers, and onboard systems, an article describing the operation and repair of electronics in BMW vehicles may be helpful – check the guide on iDrive systems and engine control units in BMW 3 and 5 Series.

Mercedes Electronic Control Modules and Controllers – Further Expansion

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 control modules, auxiliary controllers, or additional electronic systems, check the available parts in the Mercedes Electronic Control Modules and Controllers category.

If you want to better utilize the potential of the aftermarket and consciously choose used electronic components, it is worth familiarizing yourself with practical tips for purchasing parts from dismantling – read the guide to used car parts to better plan the repair of your Mercedes.