Mercedes W177 ABS Speed Sensor Front Left Right N/O/S A2045400117

Mercedes W177 ABS Speed Sensor Front Left Right is a component from the ABS speed sensor category, designed to operate within the anti-lock braking system of Mercedes vehicles. It enables precise reading of wheel rotational speed on the front axle, which translates into stable ABS system operation and support for modern safety systems. Thanks to its factory design dedicated to Mercedes W177 models, the sensor ensures a proper fit and secure seating in the steering knuckle.

Specifications and technical data

• SKU: A2479050000
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2479050000
• Substitutable numbers: A2479050000, A 247 905 00 00
• Location on the vehicle: Front, Left, Right
• Category: ABS Speed Sensors

Purpose and vehicle placement

The presented speed sensor is designed for installation on the front axle, with the possibility of use on either the left or right side. This solution facilitates component selection during ABS system maintenance and allows for flexible use of the part depending on the vehicle's needs. Placement in the immediate vicinity of the wheel hub enables accurate reading of pulses from the pulse ring, which is crucial for the correct operation of the anti-lock system.

Function in the ABS system

The ABS speed sensor in a Mercedes is responsible for generating a wheel rotational speed signal, which is then sent to the brake system controller. Based on this data, the system:

• monitors wheel grip during braking,
• controls pressure in the brake circuits to limit wheel lock-up,
• supports the operation of electronic stability control and traction control systems.

A functional ABS speed sensor helps maintain predictable vehicle behavior during emergency braking and on surfaces with varying grip. Replacing a damaged element with the correct sensor dedicated to the Mercedes W177 minimizes the risk of electronic errors and warning lights appearing on the instrument cluster.

Characteristics and advantages of use

The offered element comes from a Mercedes vehicle, which means that its geometry, connector type, and mounting method comply with the manufacturer's factory requirements. Thanks to this:

• installation proceeds without the need for electrical system modifications,
• the correct working distance between the sensor and the pulse ring is maintained,
• the ABS system controller receives a signal with parameters consistent with the original specification.

As a used item, the sensor is a reasonable choice for vehicle maintenance, allowing for reduced repair costs while maintaining compatibility with the factory system. It is a practical solution for users who want to restore proper ABS system operation without investing in more expensive replacements of uncertain origin.

Selection and practical application

When selecting an ABS speed sensor for a Mercedes W177, it is crucial to match it to the specific version of the braking system and ensure compatibility with the vehicle's electrical installation. The offered model is intended for operation on the front axle, which should be taken into account when planning the replacement. In practice, the sensor is used in situations such as:

• the appearance of ABS or ESP system errors related to wheel speed reading,
• damage to the signal cable or connector at the wheel,
• corrosion or mechanical damage to the sensor housing.

Replacing it with the correct sensor dedicated to the Mercedes W177 helps restore stable operation of safety systems, improving comfort and braking predictability. This is particularly important in daily operation, where the ABS system often works unnoticed but has a real impact on driving safety.

If you are planning a comprehensive repair or upgrade of the braking zone in your Mercedes and need other elements from the same group, such as additional sensors, signal cables, or mounting elements, check the available parts in the Mercedes ABS speed sensor category.

Used ABS sensor and repair cost-effectiveness

Choosing a used ABS speed sensor can be a beneficial solution, especially when you want to keep the vehicle in good technical condition at reasonable service costs. An element sourced from the dismantling of a vehicle of the same brand retains factory operating parameters and is structurally matched to the Mercedes W177 braking system. This helps avoid problems typical of random replacements with uncertain specifications.

If you want to better understand when choosing used electronic components and sensors makes sense, it is worth reading the advice contained in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, which discusses the practical aspects of selecting such parts.