How To Replace Knock Sensor (7 Steps): A Step-By-Step Guide

The knock sensor is a device that is used to detect the knocking noise that is produced by the engine. If the knock sensor detects this noise, it will then send a signal to the engine control unit (ECU) to adjust the ignition timing. This will help to reduce the knocking noise that is being produced by the engine.

If your car is starting to sound like it’s struggling when you turn on the ignition, or if it’s having a hard time idling, there’s a chance your knock sensor needs to be replaced. Replacing a knock sensor is not a difficult task, but does require special tools. This article will show you how to do just that. You’ll need a few tools and about an hour of time to complete the job.

If the knock sensor fails, it will need to be replaced. Learn how to replace the knock sensor on your car in this helpful tutorial.

How To Replace Knock Sensor

What Is Knock Sensor
Knock Sensor

You may change the knock sensor yourself or have it replaced by a mechanic or a dealership. It is suggested that you take it to a regular mechanic or conduct the work yourself to save hundreds of dollars in labor costs. The average time spent on the knock sensor is roughly an hour, with very little effort required, just remember where everything goes back.

The following steps should be followed for replacing the knock sensor, carefully.

  1. If you were driving the car, keep the engine off till it gets cool. Start from the hood. First of all, open the hood of the car.
  2. The next step is locating the knock sensor. Don’t be confused with the knock sensor and oil pressure sensor. Be careful in this regard. The knock sensor is fixed with the engine block to detect the sound of the engine precisely.
  3. After locating the sensor, remove the cable assembly from it and keep the cable assembly aside.
  4. By using the socket wrench and moving in the counterclockwise carefully, remove the knock sensor.
  5. Put the new knock sensor in the place of the knock sensor, by repeating the same procedure, which was for removing the knock sensor.
  6. Fix the cable assembly with the sensor as it was with the old knock sensor. If you think that will forget it, you can capture a photo of the cable assembly which was for the old knock sensor.
  7. As the knock sensor is replaced, close the hood and start the engine. Check the engine light warning and other symptoms of the faulty knock sensor. If none, you have replaced it correctly and the engine will run smoothly.

All in all, the knock sensor is an important component for the proper working of the engine. If you found any issue with it, replace it as soon as possible for better fuel mileage and smooth working of the engine.


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