ABS Light Still On After Sensor Replacement; What You Should Do?

The ABS sensor is an important safety feature in cars. It detects when a wheel is about to lock up and automatically reduces brake pressure to help the driver maintain steering control and avoid skidding. ABS sensors measure the rotational speed of the wheels and send a signal to the ABS system to modulate the brake pressure and help prevent wheel lockup.

We see a lot of people keep reporting that their ABS light is still on after the replacement of the sensor. In this article, we discuss what could be the reason for it and any fixes you can do to fix it. So stick around until the end to find out what you’ve been looking for. 

Table of Contents

Why is my ABS light on after replacing the ABS sensor?

ABS Light Still On After Sensor Replacement

Theoretically, the lights ought to go out once the damaged sensor has been replaced and the ABS controller is receiving a reliable reading from it. If the light is still on, your mechanic should still be able to read the DTC.

It is possible that the ABS sensor was not properly installed, or the wiring was not connected correctly. It could also be that the ABS sensor is not compatible with the car’s system. It is best to have the issue checked and diagnosed by a professional mechanic. The mechanic can then use specialised diagnostic equipment to find out what the exact issue is and replace any faulty parts if necessary. 

Additionally, it is also important to make sure that all the connections are properly seated, and that any wiring is properly connected. Doing so should help resolve the issue and turn off the ABS light.

So what can you do? Disconnecting the battery would reset everything, which you could try on your own before checking to see if the light returns. If it does, I would have your mechanic read it again (there is most likely a DTC at this point)


Another fix for when the ABS light keeps ON.

If the warning lights remain off after manually erasing the trouble codes with the help of an appropriate scan tool, the issue has been fixed. 

If the lights come back on, either the wheel speed sensor was not faulty (which would not be unusual given that the output of the sensor must be directly tested in order to determine whether the sensor is faulty as opposed to a situation where there is simply a loose connection in the circuit to and from the sensor; trouble codes CANNOT be the only basis for condemning the sensor; it MUST be tested), or there are multiple causes of the fault.

How long does it take for the ABS light to turn off?

Again, it’s completely normal for the ABS Warning Light to flash on and off in this manner, and depending on your car, it typically lasts for 2-4 seconds. We have a problem when the ABS light is illuminated for a prolonged period of time.

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How does the ABS sensor go bad?

The ABS sensor can go bad due to age, dirt, corrosion, or mechanical damage. The sensor can also become damaged due to a faulty ABS system or a wiring issue. 

Common signs of a faulty ABS sensor include the ABS light coming on, the brakes not functioning properly, a loud grinding noise when braking, or the vehicle pulling to one side when braking.

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How do you calibrate an ABS sensor?

  1. Begin by turning the vehicle’s engine off and then jack up the car until the wheel being worked on is off the ground.
  2. Remove the wheel and locate the ABS sensor, which will be positioned near the wheel hub.
  3. Disconnect the electrical connector to the sensor and use a ratchet to remove the mounting bolts.
  4. Take the ABS sensor and place it in a vice to hold it steady.
  5. Use a multimeter to test the resistance of the sensor.
  6. If the resistance is not within manufacturer’s specifications, adjust it by turning the adjusting screw until the desired resistance is achieved.
  7. Reinstall the ABS sensor, reconnect the electrical connector and reattach the wheel.
  8. Lower the car and test the ABS system to make sure it is working properly.

How do I manually test my ABS sensor?

  1. Begin by checking the wiring on the ABS sensor. Inspect the wiring for any signs of damage, corrosion, or loose connections.
  2. Check the sensor itself for any signs of physical damage or corrosion.
  3. Using an ohm meter, check the resistance of the sensor. It should be within its specified range.
  4. If the resistance is within the specified range, test the output voltage of the sensor. It should also be within its specified range.
  5. If the voltage is within its specified range, test the circuit for any shorts or open circuits.
  6. If there are no shorts or open circuits, then the ABS sensor is working properly.

Is it safe to drive with ABS and brake light on?

ABS Light Still On After Sensor Replacement

No, it is not safe to drive with the ABS and brake light on. This indicates that there may be a malfunction in your ABS system or brakes, which could cause you to lose control of your vehicle. Have a qualified mechanic inspect your brakes and ABS system as soon as possible. 

If the problem is not fixed, you could have difficulty stopping or controlling your vehicle when it is necessary, which could lead to a crash. Additionally, driving with your brake light on can damage your brakes, making the problem more expensive to fix.

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Would low brake fluid cause ABS light to come on?

Yes, low brake fluid can cause the ABS light to come on. This is because the ABS system uses a brake fluid pressure sensor to monitor the pressure of the brake fluid. If the brake fluid pressure is too low, the ABS system will detect this and turn on the ABS light as a warning.

How much does it cost to fix ABS light?

The cost to fix an ABS light can vary greatly depending on the cause of the problem. If the ABS light is on due to a faulty sensor, it may cost up to $400 to replace the sensor. Other issues, such as a faulty ABS pump or module, may cost up to $1,000 to repair.

Can blown fuse cause ABS light to come on?

Yes, a blown fuse can cause the ABS light to come on. A blown fuse can disrupt power to the ABS system, which will cause the ABS light to come on.

Can low tire pressure cause ABS light to come on?

No, low tire pressure will not cause the ABS light to come on. Low tire pressure can cause the Tire Pressure Monitoring System (TPMS) light to come on, but it will not cause the ABS light to come on.

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