Battery Relay Mercedes W211 CLS W219 Module Control Unit 12V A0025426419

The Mercedes W211 CLS W219 Glow Plug Relay is a specialized component of the glow plug supply system, designed for use in Mercedes vehicles. It is responsible for precise control of the glow plugs' operation, which translates to reliable diesel engine starting and stable operation during the warm-up phase. A used relay from this series is a technical solution that allows for an economical yet professional repair of the glow system.

Specifications and technical data

• SKU: A0025426419
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025426419
• Substitutable numbers: A0025426419, A 002 542 64 19, 0332002167, 0 332 002 167, KD
• Category: Relays

Purpose and Function of the Glow Plug Relay

The described relay is a control element from the Relays category, dedicated to Mercedes E-Class W211 and CLS W219 models. Its task is to control the power supply to the glow plugs according to signals from the engine control unit, in order to ensure the correct combustion chamber temperature during starting and in the initial phase of the engine's operation.

Stable operation of the relay limits the risk of cold start problems, uneven engine running after startup, or excessive smoking. A correctly selected component allows for the restoration of proper glow system operating parameters without the need to interfere with other components.

Benefits of Using an Original Mercedes Relay

Using a relay designed for specific Mercedes models ensures:

• appropriate time characteristics for glow plug heating,
• proper cooperation with the vehicle's factory electronics,
• maintenance of starting parameters in line with manufacturer's specifications,
• reduction of the risk of engine control unit errors related to the glow system.

This makes the relay a technically consistent solution for users expecting compatibility with the original installation and predictable vehicle behavior in low temperatures.

Product Characteristics and Condition

The offered element comes from the Relays group and is a Mercedes brand product, which means adherence to the factory design concept and compatibility with wiring harnesses and engine bay mounts. The used nature of the part allows for reduced repair costs while maintaining proper functionality, provided that other components of the glow system are correctly installed and diagnosed.

The relay is suitable as a replacement for the factory-installed control module for glow plugs in diesel engines used in Mercedes W211 and CLS W219, especially in situations where errors related to the glow system or cold start problems occur.

Selection, Installation, and Integration with the Vehicle System

Before installation, it is recommended to verify the relay's compatibility with the vehicle based on the OEM part number and available interchange numbers in the technical specification. Correct selection guarantees proper connection with the electrical system and correct communication with the engine control unit.

During installation, it is worth paying attention to:

• the condition of electrical connectors and the absence of corrosion on the pins,
• proper seating in the socket and stable mounting,
• verification of the condition of the glow plugs and the power supply system,
• clearing any errors in the control unit after replacing the element.

This approach allows for a comprehensive restoration of the glow system's efficiency and reduces the risk of recurring faults due to overlooking other installation components.

If you are planning a comprehensive repair or upgrade of the power supply and control area for glow plugs in your Mercedes and need other components from the same group, such as control modules, auxiliary relays, or glow circuit control elements, check the available parts in the Mercedes Relays category.

Technical Support and Selection Safety

When working with systems responsible for starting and driving safety, it is advisable to rely on proven diagnostic procedures and reliable sources of knowledge. For components such as relays, control modules, or brake system components, proper assessment of their technical condition is crucial for vehicle reliability.

If you are interested in how to safely choose used components in critical vehicle systems, read the guide: Used Brake System: How to Safely Select Discs, Calipers, and ABS?. Although it mainly concerns brakes, the principles of verification and selection presented there can largely be applied to other key electrical and electronic components as well.