How To Tell Which Wheel Speed Sensor Is Bad?

If your car is having trouble with its ABS system, one of the first things you should check is the wheel speed sensors.

There are usually one or two sensors per wheel, and they are responsible for measuring how fast the wheel is turning.

How To Tell Which Wheel Speed Sensor Is Bad

If a sensor is not working properly, it can cause the ABS system to malfunction.

There are a few ways to tell if a wheel speed sensor is bad.

  • Look at the speed sensor output on a scope while the car is driven
  • If the output is not a nice, clean sine wave, then the sensor is probably bad
  • Another way to test the sensor is to measure the resistance between the two wires going to the sensor
  • The resistance should be around 700 ohms
  • If it is much higher or lower, the sensor is probably bad


How to check the wheel speed sensor with multimeter?

A wheel speed sensor is a type of tachometer that measures the speed of the wheels on a vehicle.

There are two main types of wheel speed sensors: active and passive. Active wheel speed sensors generate a signal that is proportional to the speed of the wheel, while passive wheel speed sensors detect the speed of the wheel by sensing the change in the frequency of the wheel’s rotation.

To check a wheel speed sensor with a multimeter, first connect the positive lead of the multimeter to the sensor’s signal wire.

Next, connect the negative lead of the multimeter to the ground wire. Finally, turn on the multimeter and read the voltage reading.

If the reading is within the specified range, the sensor is working properly.

Symptoms of a bad wheel speed sensor

If your car is equipped with ABS brakes, then it also has wheel speed sensors. These sensors are responsible for relaying information to the ABS system about the speed of your wheels.

If a sensor is malfunctioning, it can cause the ABS system to engage prematurely or not at all.

Here are some symptoms that may indicate a bad wheel speed sensor: -The ABS light is illuminated on the dashboard

-The ABS system is not engaging when it should

-The ABS system is engaging when it shouldn’t

-The brakes feel “spongy” when you press on the pedal

-The brakes make a grinding noise when you come to a stop

If you notice any of these symptoms, it’s important to have the vehicle checked out by a qualified mechanic as soon as possible.

A bad wheel speed sensor can cause serious problems with your braking system, and can ultimately lead to an accident.

How to test a wheel speed sensor?

If you have a wheel speed sensor issue, there are a few tests you can do to diagnose the problem.

First, check for any loose or damaged wires. Next, check the connector for any corrosion or damage.

Finally, test the sensor itself with a multimeter. If the sensor is damaged, it will need to be replaced.

However, if the issue is with a loose or damaged wire, you can repair it by soldering or replacing the wire.

Corroded connectors can be cleaned with a wire brush or replaced altogether. Once you have diagnosed the issue, you can then replace or repair the component as needed. This should fix any issues you are having with your wheel speed sensor.

Bad wheel speed sensor noise

If your car is making a bad wheel speed sensor noise, it’s likely because the sensor is damaged or dirty.

The wheel speed sensor is responsible for sending a signal to the car’s computer to let it know how fast the wheels are turning.

If the sensor is damaged, the signal can be interrupted, causing the car to make strange noises.

If the sensor is dirty, the signal can be distorted, also causing the car to make strange noises.

Either way, it’s important to get the problem fixed as soon as possible to avoid any further damage to your car.

What is the best way to test a wheel speed sensor?

Today we’re going to be talking about the best way to test a wheel speed sensor. This is an important topic because a wheel speed sensor is a key component in many modern vehicles.

It’s responsible for providing information to the vehicle’s computer about the speed of the wheels.

This information is used for a variety of purposes, such as ABS (anti-lock braking system) and stability control.

If the sensor isn’t working properly, it can cause all sorts of problems. There are a few different ways to test a wheel speed sensor.

The first is with a multimeter. You’ll need to disconnect the sensor from the vehicle’s computer and then connect the multimeter leads to the sensor’s terminals. The multimeter will then give you a reading in volts.

This method is relatively simple and it’s the one that we recommend. Another way to test a wheel speed sensor is with an oscilloscope.

This is a more complex method and it requires special equipment, but it can be very helpful in diagnosing problems.

With an oscilloscope, you can see the waveform of the sensor’s output. This can be very helpful in determining if the sensor is working properly.

No matter which method you use, it’s important to be very careful when handling the sensor.

It’s a sensitive piece of equipment and it can be easily damaged. We hope this article has been helpful. If you have any further questions, please feel free to contact us.

What happens when a wheel speed sensor goes bad?

A wheel speed sensor, also called an ABS sensor, monitors the speed of your wheels and sends this information to your car’s computer.

The computer uses this information to prevent the wheels from locking up during heavy braking and to help the traction control system regulate the power to the wheels.

If a wheel speed sensor goes bad, it can cause the traction control system to malfunction.

This can lead to the wheels slipping, even during light braking. In some cases, the check engine light may come on.

How many wheel speed sensors are on a car?

Wheel speed sensors are used to measure the rotational speed of a wheel. Most modern cars have four-wheel speed sensors, one for each wheel.

The sensors are usually mounted on the hub assembly or on the brake backing plate.

The signal from the sensor is used by the ABS system to determine if a wheel is about to lock up.

If the system detects a wheel lock, it will automatically apply the brakes to that wheel to prevent the lockup.

How do you test an ABS speed sensor?

An ABS speed sensor monitors the speed of a vehicle’s wheels and sends this information to the ABS control module.

The ABS control module then uses this information to determine if the vehicle is at risk of skidding or losing traction.

To test an ABS speed sensor, a technician will connect a specialized ABS scanner to the vehicle’s diagnostic port.

This scanner will read the ABS speed sensor data and allow the technician to see if the sensor is functioning correctly.


You can tell which wheel speed sensor is bad by looking at the speed at which the wheels are turning.

If one sensor is reading a higher speed than the other, it is likely the bad sensor.