Mercedes W169 W245 W204 W212 Relay 4-Pin Black Hella SET A0025427219

Mercedes W169 W245 W204 W212 Relay Black Hella Set A0025427219 is an original component from the Relays group, designed for use in selected Mercedes models. This used OEM component ensures compatibility with the vehicle's factory electrical system, maintaining proper operating parameters for control and protection circuits.

Specifications and technical data

• SKU: A0025427219-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025427219
• Substitutable numbers: A0025427219, A 002 542 72 19, 4RA007791, 4RD007 791
• Part type: Relay
• Category: Relays

Technical Characteristics and Application

The presented black Hella relay is an electrical system component responsible for reliably switching higher load circuits with low-current control. The OEM design ensures compliance with factory wiring diagrams in Mercedes vehicles of the W169, W245, W204, and W212 series, facilitating diagnostics and subsequent service.

Thanks to the use of an original manufacturer solution, the relay works with existing harnesses, sockets, and control modules without requiring any modifications to the installation. This is particularly important in vehicles equipped with advanced electronics, where the stability of electrical parameters affects the proper functioning of many comfort and safety systems.

Advantages of Using an Original Relay

Choosing an original Hella relay for your Mercedes helps reduce the risk of problems typical of aftermarket replacements with uncertain parameters. Key benefits include:

• maintaining compliance with factory current and voltage values,
• proper fit for the mounting socket in the fuse box or relay module,
• stable operation of controlled systems, without undesirable voltage drops and interference,
• easier diagnostics based on manufacturer service documentation.

For the user, this means more predictable vehicle behavior and a lower risk of secondary faults resulting from improper operation of electrical components. An original relay is particularly recommended for repairs of systems responsible for safety and key vehicle functions.

Condition, Origin, and Fitment

The offered relay is a used component, sourced from disassembly, which allows for a favorable price-to-quality ratio while maintaining OEM standards. Such components are often chosen in professional workshops where both correct fitment and consistent operating parameters are crucial.

When selecting the correct relay for a specific vehicle, it is advisable to rely on the OEM part number and interchangeable numbers, as well as the vehicle's identification data. This allows for precise confirmation of compatibility with a given equipment version and avoids problems with installation or system operation.

Practical Installation and Operational Tips

When replacing the relay, it is recommended to:

• check the condition of the socket and contacts for corrosion and overheating,
• verify the correctness of power supply and control in the vehicle's wiring,
• check the load of the circuit switched by the relay,
• apply diagnostic procedures in accordance with Mercedes service documentation.

This approach not only allows for the replacement of the component itself but also helps eliminate potential causes of previous failures. A correctly selected and installed relay contributes to stable operation of electrical systems and reduces the risk of unplanned vehicle downtime.

If you are planning a comprehensive repair or upgrade of the electrical system in your Mercedes and need other components from the same group, such as starter relays, light relays, or fan relays, check the available parts in the Mercedes Relays category.

For users interested in deepening their knowledge about selecting original OEM components and methods for verification by part numbers and vehicle identification, the following guide article may be helpful: Audi Five-Cylinder Engine – Legend and Selection of Used OEM Parts.