ABS speed sensor

The ABS speed sensor is a key component of the ABS (Antilock Braking System), which monitors the rotational speed of each wheel. Thanks to its operation, the ABS system can prevent the wheels from locking during braking, which increases vehicle stability and allows for effective maneuvering in challenging road conditions. At Global Parts, you'll find a wide selection of used car parts , including ABS speed sensors, perfectly suited to BMW , Audi , Mercedes , Volkswagen , Mini , and other brands .

What is an ABS speed sensor and how does it work in practice?

The ABS speed sensor (wheel speed sensor) is an electronic component mounted on the wheel hub or steering knuckle. Its function is to measure wheel rotational speed to within a few revolutions per minute. Two basic types of sensors are used in modern vehicles:

• inductive (passive) – generate alternating voltage (AC) proportional to the rotational speed,
• magnetoresistive / active (Hall) – powered by 5–12 V, generate a digital square-wave signal. The signal from the sensor goes to the ABS controller (hydraulic-electronic module), which analyzes speed differences between wheels up to several times per second. If one wheel begins to decelerate suddenly (e.g., on a slippery surface), the system reduces the braking pressure on that wheel, preventing it from locking. The ABS speed sensor works directly with:
• impulse ring (ABS crown),
• wheel bearing with built-in magnetic ring,
• ESP/ASR module (traction control),
• hill start assist system. This means that the compatibility and matching of the sensor to the specific engine version and vehicle year is important not only for the ABS, but also for the entire electronics of the vehicle stability control.

What are the functions of the ABS speed sensor ?

The ABS speed sensor plays key roles in the operation of the ABS system:

• Wheel speed measurement – Sends data to the ABS module, which analyzes the speed of each wheel.
• Anti-lock braking – Supports the operation of the ABS system, enabling optimal distribution of braking force.
• Improving driving safety – Thanks to precise measurements, the ABS system increases vehicle stability during sudden braking.

Technical parameters and design differences of sensors

Depending on the vehicle model, the ABS speed sensor may differ:

• cable length (e.g. 60 cm – 120 cm),
• resistance (in inductive sensors typically 800–2000 Ω),
• type of plug (2-pin or 3-pin),
• mounting method (M6/M8 screw or pressed into the steering knuckle). Below is a list of basic types of sensors: | Sensor type | How it works | Power supply | Application | |---|---|---|---| | Inductive (passive) | Generates AC voltage as the ring rotates | No power required | Older models (e.g. cars up to approx. 2005) | | Magnetic / Hall (active) | Generates a digital signal | 5–12V | Newer vehicles with ESP and ASR |

These differences are important when selecting parts – especially when taking into account compatibility with the ABS module and the stability control system.

Why is it worth taking care of the ABS speed sensor ?

A malfunctioning ABS speed sensor can affect the operation of the ABS system and increase road safety. Typical symptoms include:

• ABS light on – Indicates a problem with one or more sensors.
• ABS not working when braking – This may be due to a damaged sensor or problems with its connections.
• Vehicle diagnostic errors – The car’s computer system may indicate faults related to the speed sensor. If you need a replacement, you'll find the right used car parts at Global Parts that will restore the full functionality of your ABS system.

Symptoms and error codes related to the ABS sensor

In computer diagnostics, the ABS speed sensor often generates errors such as:

• "no signal from wheel speed sensor",
• "incorrect speed signal",
• "speed difference between axles". In practice, this means that the ABS controller has detected a signal discrepancy. Symptoms can appear at speeds as low as 15–20 km/h, as above this speed the system begins active data analysis. It is worth remembering that the ABS speed sensor also has a direct impact on the operation of the following systems:
• ESP (Electronic Stability Program),
• ASR (traction control),
• adaptive cruise control on some models.

How to choose the right ABS speed sensor ?

When choosing an ABS speed sensor, there are several key aspects to consider:

• Vehicle-specific fit – Each ABS system has its own specific technical requirements. At Global Parts , you'll find ABS speed sensors perfectly matched to BMW , Audi , Mercedes , Volkswagen , Mini , and more .
• Technical condition – The sensors used should be fully functional, free from mechanical and electrical damage.
• Sensor Type – Make sure the sensor you choose matches your vehicle’s ABS system (inductive or magnetic).

Sensor selection procedure – step by step

To ensure full fit and compatibility of the ABS speed sensor:

1. Check the exact model, year and engine version of your vehicle.
2. Determine whether the sensor is for the front or rear axle (left/right side).
3. Verify sensor type (active or passive).
4. Compare the shape of the plug and the length of the cable.
5. Compare with impulse ring or wheel bearing if necessary. This approach minimizes the risk of incompatibility and facilitates installation without the need to modify the installation.

Why choose used ABS speed sensors ?

Used car parts , such as used ABS speed sensors , is an economical solution that allows you to save money while maintaining high quality. By choosing used ABS components, you gain:

• Lower costs – Used sensors are much cheaper than new ones, but offer equally high quality.
• Ecology – Recycling parts supports environmental protection and reduces waste.
• A wide range – In our store you will find used ABS speed sensors for the most popular car brands.

How to take care of the ABS speed sensor ?

To ensure that the ABS speed sensor functions reliably for a long time, it is worth following a few rules:

• Regular inspections – Check the condition of the sensor during periodic technical inspections of the braking system.
• Keep it clean – Remove dirt and deposits from the sensor surface that may interfere with its operation.
• Replace damaged sensors on time – Failure to have a functioning sensor can reduce the effectiveness of the ABS system. If you need a replacement, Global Parts has the right used car parts to ensure the reliability and safety of your ABS system.

FAQ – Frequently asked questions about ABS speed sensors

Question	Answer
What is an ABS speed sensor?	This is an electronic sensor mounted on the wheel that measures its rotational speed and transmits data to the ABS controller.
How does a wheel speed sensor work?	It reads the movement of the pulse ring and generates an electrical signal (analog or digital) that the ABS module analyzes.
What is the difference between an active and a passive sensor?	An active sensor requires power and generates a digital signal, while a passive sensor operates without power and generates an alternating voltage depending on the rotational speed.
Does the ABS sensor affect ESP?	Yes, the sensor data is used by the stability control system and traction control.
Where is the ABS speed sensor located?	Usually at the wheel hub or in the steering knuckle, near the impulse ring.
Can one ABS sensor be replaced?	Yes, the sensors are independent elements – the one that applies to a specific wheel is replaced.

Summary: ABS Speed Sensor at Global Parts Automotive Store

The ABS speed sensor is a key component of the braking system, ensuring the effectiveness and precision of the ABS system, increasing road safety. By maintaining its technical condition, you can improve vehicle control and avoid braking problems. The Global Parts automotive store invites you to browse our wide selection of original used car parts . Whether you're looking for car parts for BMW , Audi , Volkswagen , Mercedes, Mini , or others, you'll find them at competitive prices. We strive to ensure every customer finds the right parts for their car, and if you have any questions or concerns about selecting the right components, we're happy to help! Please contact us – we're here to help! For more information and interesting facts, visit our automotive blog .