Mercedes X253 Engine Wiring Harness Line Supply Line A2741504704

Mercedes X253 Engine Wiring Harness Line Supply Line is an original component from the Cables, harnesses and connectors group, designed for professional maintenance of the powertrain in Mercedes vehicles. Designed as a factory engine bay wiring harness, it ensures precise connection of sensors, actuators, and the control unit, which translates into stable engine operation and easier diagnostics.

Specifications and technical data

• SKU: A2741504704
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2741504704
• Substitutable numbers: A2741504704, A 274 150 47 04
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the engine system

The engine wiring harness in X253 series models is responsible for the orderly routing of electrical signals between the control unit and key powertrain components. It includes connections to, among others, operating parameter sensors, control elements, and engine accessories, which helps maintain system integrity and reduces the risk of interference.

Thanks to its factory-fit design for the Mercedes electrical architecture, the harness maintains the correct cable lengths, appropriate wire diameters, and connector placement, which facilitates installation and minimizes the possibility of incorrect connector mating.

Construction, connectors, and compatibility

The offered harness belongs to the Cables, harnesses and connectors group, meaning it was designed as an integral part of the engine bay electrical system. The connectors used are factory-matched to the sockets on engine accessories and the control unit, allowing for plug-and-play installation without the need for system modifications or the use of adapters.

The original construction ensures proper shielding and cable routing, which limits the impact of electromagnetic interference on control signals. This is particularly important in modern engines, where the precision of parameter readings has a direct impact on engine smoothness, fuel consumption, and exhaust emissions.

Condition, service application, and benefits of installation

This engine wiring harness is a used component, making it an attractive service solution while maintaining original OEM specifications. It is suitable for both repairs following mechanical or thermal damage to the installation, as well as for replacing harnesses in vehicles with electrical issues resulting from previous unprofessional modifications.

The main benefits of using an original harness include:

• maintaining factory cable routing and mounting points,
• secure fit of connectors to engine accessories,
• reducing the risk of installation errors and control unit communication problems,
• the ability to restore the installation to a near-factory state without having to fabricate new wiring.

Application in diagnostics and modernization

Replacing the engine wiring harness is often a key step in resolving difficult-to-diagnose electrical faults, such as intermittent sensor errors, circuit breaks, or module communication issues. Using an original harness helps eliminate many potential sources of problems associated with previous "shortcut" repairs.

This component can also be used for comprehensive powertrain upgrades within the same platform, when it is necessary to adapt the installation to a different accessory configuration while maintaining manufacturer standards.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional harnesses, cable sections, or compatible connectors, check the available parts in the Mercedes Cables, harnesses and connectors category.

To better plan service work and reduce vehicle downtime in the workshop, it is worth checking out practical tips on selecting used OEM components – you can find them in the article Availability of car parts off the shelf vs. repair time – how do used OEM parts shorten workshop stays?.