Mercedes-Benz E M W163 OM612 W211 OM646 Coolant Temperature Sensor A0005425118

Mercedes-Benz E M W163 OM612 W211 OM646 Coolant Temperature Sensor is an original measuring system component responsible for the precise reading of coolant temperature in Mercedes vehicles. A properly functioning sensor supports stable engine operation, optimizes control parameters, and helps protect the power unit from overheating. This used OEM component is a sensible choice for drivers looking for a proven solution at an attractive price.

Specifications and technical data

• SKU: A0005425118
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0005425118
• Substitutable numbers: A0005425118, A 000 542 51 18, BG
• Category: Air Intake & Fuel Sensors

Function and application of the coolant temperature sensor

The coolant temperature sensor in Mercedes W163 and W211 models is responsible for transmitting information about the current coolant temperature to the engine control unit. Based on this signal, the system manages, among other things, fuel injection, ignition timing, radiator fan operation, and the engine warm-up strategy. A functional component ensures stable operation in both cold and warm conditions and helps maintain proper exhaust emission parameters.

Replacing a worn or damaged sensor with an original component from the same group allows you to restore correct temperature readings and eliminate issues such as rough engine idling, increased fuel consumption, or incorrect fan activation.

Benefits of using an original Mercedes sensor

Choosing a used, original coolant temperature sensor for a Mercedes offers a number of practical advantages:

• preservation of factory temperature measurement characteristics, consistent with engine control unit maps,
• reliable mechanical and electrical fitment for installation in Mercedes W163 and W211 vehicles,
• reduction of the risk of control unit errors resulting from incorrect sensor signals,
• possibility of an economical repair without sacrificing an OEM component.

As a result, the driver receives a component that works with the control system exactly as intended by the manufacturer, which translates into predictable engine behavior under various load and temperature conditions.

Product condition and installation aspects

The offered sensor belongs to the Air and fuel intake sensors group, although in practice, it operates within the cooling system, monitoring liquid temperature. As a used part, it is a good solution in situations where the existing component generates errors, causes incorrect temperature readings on the instrument cluster, or interferes with the engine control unit.

Before installation, a standard service procedure is recommended: checking the socket, electrical connector, and the seal at the mounting point. A correctly installed sensor quickly restores accurate temperature readings, which can be verified both on the dashboard and through computer diagnostics.

Selection by part numbers and compatibility – purchase support

Due to differences between specific engine versions and model years, it is crucial to verify compatibility using part numbers and vehicle data when selecting a coolant temperature sensor for a Mercedes. OEM information and replacement numbers are available in the product description to facilitate compatibility verification with your specific vehicle.

If you want to better understand how to safely choose used electronic and measuring components, including sensors, it is worth checking out our practical guide: Used automotive electronics – ECU modules and second-hand sensors. There, you will find tips on selecting by part numbers, checking compatibility, and answers to the most frequently asked questions regarding installation.

Expanding the measuring system in your Mercedes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional temperature sensors, pressure sensors, or air and fuel parameter measurement components, check out the available parts in the Mercedes air and fuel intake sensors category.

This allows you to select a consistent set of measuring components in one place, which facilitates servicing and helps maintain uniform quality of elements throughout the entire system.