Mercedes R171 271.944 271944 163HP Engine ECU Kit Key Lock A2711534691 Automatic

Mercedes R171 271.944 271944 163HP Engine ECU Kit Key Lock is a practical solution for vehicles equipped with an automatic transmission. The set belongs to the Electronic control modules and ECUs group and is intended for professional repair or replacement of the factory engine control system.

Specifications and technical data

• SKU: A2711534691-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2711534691
• Substitutable numbers: A2711534691, A 271 153 46 91, A0014466902, A 001 446 69 02, 5WK90548, A2115452308, A 211 545 23 08
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented engine control unit kit is dedicated to Mercedes R171 series models with the 271.944 163HP petrol engine, working in conjunction with an automatic transmission. Using a complete ECU + key + lock package allows for maintaining the consistency of the immobilizer system, which significantly facilitates installation and reduces the need for additional programming in the vehicle.

The system belongs to the Electronic control modules and ECUs category, responsible for precise management of engine operation, fuel dosing, ignition, and communication with other onboard systems. Thanks to this, the kit is particularly useful when replacing a damaged controller in vehicles with an automatic transmission, where proper ECU-to-transmission cooperation is crucial for smooth gear shifting.

Benefits of using a complete kit

Using a complete ECU kit with a key and lock in a Mercedes R171 with a petrol engine brings a number of practical benefits:

• maintaining the compatibility of security system components (ECU – key – lock),
• reducing the risk of immobilizer issues after installation,
• facilitating workshop work when replacing the engine controller,
• better integration with the automatic transmission compared to mismatched modules,
• the ability to restore full vehicle functionality after an engine electronics failure.

For the user, this means a faster return of the car to serviceability and a more predictable service process, which is particularly important in the case of advanced control systems used by the Mercedes brand.

Application in petrol vehicles with automatic transmission

Petrol engines from the 271.944 family combined with an automatic transmission require a properly selected controller that handles both the characteristics of the power unit and the gear shifting logic. The presented kit has been developed specifically for this configuration, which promotes stable operation of the drivetrain and correct communication between modules.

In practice, a correctly selected engine controller in a vehicle with an automatic transmission translates into:

• smoother gear shifting under various driving conditions,
• more predictable throttle response,
• consistent operation of engine and transmission protection functions.

Condition, verification, and selection by part numbers

The item comes from the secondary market and is marked as a used module with a set of accessories. Before installation, it is recommended to verify compatibility by OEM number and interchangeable numbers, as well as to compare the configuration with the vehicle's original controller. This helps to reduce the risk of hardware or software incompatibility.

If you want to better understand how to safely choose used engine controllers, how to check compatibility by VIN, OEM numbers, and hardware/software versions, the Global Parts guide will be helpful: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. You will find practical tips there regarding installation and the most frequently asked questions related to electronics from the secondary market.

Expansion of the control system in a Mercedes

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 controllers, comfort modules, or drivetrain management systems, check the available parts in the Mercedes electronic control modules and ECUs category.