Mercedes W205 Start Stop Volume Switch Center Console Lower Left A2139050102

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W205 Start Stop Volume Switch Center Console Lower Left is an original component from the Switches, control elements and ignition locks group, designed for operating the engine start and stop functions in Mercedes vehicles. It is a solution engineered for precise control of the ignition system, ensuring consistency with factory electronics and aesthetic integration into the driver's cockpit.

Specifications and technical data

• SKU: A2139050102
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2139050102
• Substitutable numbers: A2139050102, A 213 905 01 02
• Location on the vehicle: Left
• Category: Switches & Controls

Function and application of the Start Stop panel

The Start Stop panel in Mercedes W205 models is responsible for convenient, push-button engine starting, replacing the traditional key ignition. This component works with the electronic authorization and start system, allowing the driver to start or stop the engine in a controlled manner while maintaining full integration with the vehicle's factory security systems.

The placement on the left side of the cockpit promotes ergonomics – the switch is within the driver's natural reach, which facilitates operation in daily use. This type of solution improves user comfort while maintaining visual consistency with other control elements in the cabin.

Construction, integration and installation compatibility

The switch has been designed as a component that works with the factory wiring harness and Mercedes control modules. This means that once matched to the specific vehicle configuration, installation is possible in a factory-like manner, without the need for additional, non-factory electrical solutions.

Thanks to the use of an original design from the Switches, control elements and ignition locks group, the panel maintains the correct button operating characteristics, tactile feedback, and clear signals for onboard controllers. This is important for the reliability of the starting system and proper cooperation with the vehicle's safety systems.

Condition, origin and benefits of choosing a used OEM component

The offered Start Stop panel is a used item, which in practice means a beneficial combination of factory build quality and an attractive price compared to a new component. A used OEM item retains its original geometry, fitment to the dashboard, and compatibility with factory connectors, which reduces the risk of installation issues.

Choosing an original switch from dismantling is also a way to maintain the visual consistency of the interior – the texture, color, and illumination style are consistent with other cockpit elements. For users who want to better understand the advantages of such a solution, a guide describing why a used OEM part is often a more sensible choice than a replacement may be helpful – more information can be found in the article 5 reasons why a used OEM part is a better choice than a replacement.

Practical installation and operational tips

Before installing the Start Stop panel in a Mercedes W205, it is worth verifying compatibility with the specific vehicle equipment version and electronics configuration. It is recommended that the installation be carried out by a person with experience in Mercedes control systems, which minimizes the risk of connection errors and potential fault messages in the diagnostic system.

After correctly installing the switch, the starting system should operate stably, and the response to pressing the button should remain predictable and repeatable. In the case of vehicles where work is simultaneously being carried out on other safety systems, such as the braking system, it is worth familiarizing yourself with the principles of safe selection of used components – a detailed checklist can be found in the guide Second-hand braking system: how to safely choose discs, calipers and ABS?.

Expanding upgrades within control elements

If you are planning a comprehensive repair or upgrade of the cockpit area in your Mercedes and need other elements from the same group, such as function buttons, control modules, or additional switches, check the available parts in the Mercedes switches, control elements and ignition locks category.