Mercedes W177 Rear Axle Wheel RPM Speed Left N/S Sensor Wire Harness A2475400700

Mercedes W177 Rear Axle Wheel RPM Speed Left N/S Sensor Wire Harness is an original electrical system component for the braking system, designed for precise integration with the ABS sensor on the rear left axle. Thanks to its factory-fit for the W177 platform, the harness ensures a stable electrical connection, supporting the proper operation of the anti-lock braking system. It is a practical service solution for users looking to restore full ABS functionality without compromising on compatibility.

Specifications and technical data

• SKU: A2475400700
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2475400700
• Substitutable numbers: A2475400700, A 247 540 07 00
• Location on the vehicle: Rear, Left
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the vehicle

The presented harness is a component from the Wires, harnesses, and connectors group, responsible for the electrical connection between the ABS sensor and the vehicle's wiring in the rear left suspension area. The vehicle placement, defined as rear – left side, allows for clear identification of the installation area and reduces the risk of errors when selecting parts.

A correctly selected ABS sensor harness is crucial for:

• stable signal transmission from the wheel speed sensor to the brake system control unit,
• maintaining the proper operation of the ABS and related electronic stability control systems,
• minimizing diagnostic errors related to open circuits or interference in the sensor circuit.

Compatibility and fit for Mercedes W177

The harness has been designed specifically for the W177 body, meaning its geometry, wire length, and connector types are adapted to the factory mounting points in this model. This fit facilitates installation, allows for routing the wire along the original path, and reduces the risk of abrasion or mechanical stress during operation.

The original Mercedes origin translates into consistency with the vehicle's factory electrical installation, as well as compliance with the electrical parameters required by the brake system control unit. This is particularly important for vehicles equipped with advanced safety systems, where the quality of the sensor signal has a direct impact on the performance of the electronics.

Operational characteristics and installation

The item is offered as a used part, which in practice means the possibility of an economical repair of the ABS system while maintaining the manufacturer's original specifications. As an electrical system component, the harness is not subject to typical wear and tear like friction elements, so it can continue to work effectively in the vehicle if in good mechanical condition.

The main advantages of using this harness in a Mercedes W177 include:

• factory fit for the rear left suspension area,
• preservation of the original wire routing path,
• compatible connectors allowing for quick connection to the ABS sensor and vehicle wiring,
• the ability to restore proper ABS system operation after damage to the wire or connector.

Service and diagnostic application

Replacing the ABS sensor harness is recommended in situations where diagnostics indicate open circuits, insulation damage, contact corrosion, or mechanical damage to the wire in the rear left part of the vehicle. Using an original harness eliminates the need for wiring modifications, soldering, or the use of non-original connectors, which improves the reliability of the entire system.

In service practice, such a harness is often installed in parallel with the replacement of the ABS sensor itself, especially when the vehicle has been operated in harsh conditions (moisture, road salt, heavy dirt). This allows for a comprehensive elimination of error sources related to wheel speed readings on the rear left axle.

If you are planning a comprehensive repair or upgrade of the braking system's electrical installation in your Mercedes and need other elements from the same group, such as additional harnesses, signal wires, or service connectors, check the available parts in the Mercedes wires, harnesses, and connectors category.

For drivers interested in learning more about selecting components for modern powertrains and the importance of correct part compatibility with engine control systems and accessories, the Global Parts guide may be helpful: BMW B58 code – checklist before purchasing a turbocharger and intercooler for the BMW 3 Series (G20), which shows how important it is to verify component compatibility using the VIN and technical parameters.