Fuel gauge Mercedes E200 S124 Petrol M111 Fuel Tank Level Sensor A1245420104

Fuel gauge Mercedes E200 S124 Petrol M111 Fuel Tank Level Sensor is an original fuel system component designed for precise measurement of gasoline levels in the tank for S124 series models with the M111 engine. Thanks to its factory design, the sensor ensures reliable fuel level readings on the instrument cluster and stable integration with the vehicle's electrical system, which translates into comfort and predictable operation.

Specifications and technical data

• SKU: A1245420104
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1245420104
• Substitutable numbers: A1245420104, A 124 542 01 04
• Fuel type: Petrol
• Category: Other Air & Fuel Delivery

Purpose and function in the fuel system

The fuel level sensor in the Mercedes S124 with the M111 unit is responsible for continuous measurement of the amount of gasoline in the tank and transmitting the signal to the gauge on the dashboard. A properly functioning component allows the driver to monitor the vehicle's range in real-time, reduces the risk of unexpected vehicle immobilization, and facilitates planning refueling stops during trips.

The component is integrated into the vehicle's fuel system and works with the electrical installation adapted for the M111 petrol engine. Using the correct sensor for this powertrain configuration is crucial for maintaining accurate readings and stable operation of the fuel gauge.

Benefits of using an original sensor

Choosing a fuel level sensor dedicated to the Mercedes S124 with the M111 petrol engine provides a number of practical advantages:

• maintaining the factory operating characteristics of the fuel gauge,
• consistency with the original wiring harness and installation parameters,
• reducing the risk of erroneous readings or erratic fuel level fluctuations,
• easier diagnostics of potential fuel system faults.

A properly selected sensor helps maintain stable and predictable fuel system operation, which is important both in daily use and on longer trips, where the accuracy of gasoline level readings is particularly significant.

Component condition and installation aspects

The offered fuel level sensor is a used part, which, in the case of original parts for classic Mercedes models, often allows for maintaining high compliance with factory specifications. Before installation, it is recommended to perform a standard check of the electrical installation around the fuel tank and verify the condition of the connectors to ensure proper contact and trouble-free operation after replacement.

During installation, it is worth paying attention to:

• correct positioning of the sensor in the tank,
• tightness of connections at the mounting point,
• correct wiring connection in accordance with the vehicle's installation.

This approach minimizes the risk of having to remove the tank again and allows for the quick restoration of full fuel gauge functionality.

Practical application and diagnostics

Typical symptoms of wear or damage to the fuel level sensor in a Mercedes S124 include no response from the gauge, extreme readings (constantly full or empty tank), or unstable, erratic level changes. In such situations, replacing the sensor with the correct model intended for the M111 petrol version is one of the basic service steps.

Before deciding to replace it, it is worth performing basic diagnostics of the installation – check the power supply, ground, and continuity of the wires. If these elements are functional, installing the appropriate sensor is an effective way to restore correct fuel level readings and increase vehicle usage comfort.

Expanding knowledge and part selection

If you are planning a comprehensive repair or upgrade of the fuel system area in your Mercedes and need other elements from the same group, such as additional sensors, electrical installation components, or small mounting parts, check the available parts in the Other Mercedes category.

To compare the characteristics of sports powertrains with solutions used in standard versions, an article discussing the differences in engine, brake, and chassis construction may be helpful – you can find it here: Audi RS vs other models – what is hidden under the hood and chassis?. This allows for a better understanding of how important the proper cooperation of individual components, including fuel system elements, is.