Mercedes W204 W212 W222 Gas Throttle Pedal Accelerator Unit A2043000004

Mercedes W204 W212 W222 Gas Throttle Pedal Accelerator Unit is an original component from the Pedals, pedal pads and footrests group, designed for precise acceleration control in selected Mercedes C-Class, E-Class, and S-Class models. The integrated electronic potentiometer ensures stable mapping of the pedal position to the engine control unit, which translates into predictable drivetrain response and driving comfort.

Specifications and technical data

• SKU: A2043000004
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2043000004
• Substitutable numbers: A2043000004, A 204 300 00 04, A2043000100, A 204 300 01 00
• Category: Pedal Assemblies, Pads & Parts

Purpose and function in the vehicle

The Mercedes W204 W212 W222 Gas Throttle Pedal Accelerator Unit plays a key role in the electronic throttle control system (drive-by-wire). It replaces the traditional throttle cable by transmitting a signal corresponding to the current pedal depression to the engine control unit.

In practice, this means:

• smooth torque delivery across the entire rev range,
• repeatable response to pedal input,
• stable cooperation with assistance systems such as traction control or safety systems.

Thanks to its factory origin from the Mercedes brand, the operating characteristics remain consistent with the engine control software intended for the given generation of vehicles.

Construction and technical advantages

The component combines a mechanical accelerator pedal and an integrated electronic potentiometer in a single housing. This design reduces the number of mechanical and electrical connections, which promotes reliability during long-term operation.

The main technical advantages include:

• pedal geometry designed for a specific vehicle platform, ensuring ergonomic foot positioning for the driver,
• electronic position sensor optimized for cooperation with the factory engine control unit,
• rigid mounting to the body, minimizing play and unwanted vibrations while driving.

Such a solution allows for maintaining factory driving sensations, which is particularly important in premium class vehicles.

Condition, fitment, and installation

The offered item is in used condition, which allows for an economical replacement of a damaged pedal while maintaining the manufacturer's original specifications. Proper fitment for a specific vehicle must always be verified based on the part number and interchangeable numbering in service documentation or the manufacturer's catalog.

The typical installation procedure includes:

• removing the old pedal along with the connector harness,
• installing the new component in the factory mounting points,
• connecting the electrical connector according to the original wiring layout.

In many cases, the installation is similar to a plug-and-play solution; however, one should always follow the service guidelines for the specific model.

Application in Mercedes W204, W212, W222 models

The product has been developed for selected versions of the Mercedes C-Class (W204), E-Class (W212), and S-Class (W222) that utilize an electronic accelerator pedal. Using an original component from the same construction group allows for maintaining the consistency of the drivetrain operation, including:

• acceleration characteristics intended by the manufacturer,
• proper cooperation with automatic or manual transmissions,
• correct operation of safety systems dependent on the pedal position signal.

For users expecting to maintain the factory driving character of the vehicle, using an original pedal with a potentiometer is a technically sound solution.

Technical support and related content

If you are planning a comprehensive repair or upgrade of the acceleration control zone in your Mercedes and need other components from the same group, such as brake pedals, pedal pads, or driver footrests, check the available parts in the Mercedes Pedals, pedal pads and footrests category.

For a better understanding of the impact of accessories on engine performance and the selection of appropriate components in popular C-Class and E-Class models, it is worth reading the guide article Reliability under the star sign – how to maintain engine accessories in popular Mercedes-Benz C-Class and E-Class models?, which discusses practical aspects of operation and replacement of key components.