What To Do After Replacing A Crankshaft Sensor? [Know the Unknown]

Does your car stall intermittently or check engine light when driving? If yes, understand there is an issue with the crankshaft position sensor. In this circumstance, you should replace the crankshaft sensor immediately. Did you finish replacing the crankshaft sensor but don’t know what to do after replacing the crankshaft sensor?

After replacing the sensor you should do several things. Among them, first, you should look for the correct installation. Check whether the installation is accurate or not. Next, you should reset it accurately to assist the ECU in relearning or detecting its position. These are vital things to check.

You may not understand why you need to do these things or how to perform them accurately. No worries. This article will guide you through this process in detail so that you can learn it from the core.

Things you should do after replacing the crankshaft sensor

Things To Do After Replacing A Crankshaft Sensor

Many car enthusiasts or owners are in a dilemma when it comes to crankshaft sensor changing. They are hesitant about what they should do after changing the crankshaft. Therefore, this guide is arranged keeping them in mind.

Read also: Can You Drive With A p0299 Code?

Task #1: Ensure The Proper Installation

After replacing the crankshaft, the common issue you might face is poor installation or an incorrectly installed sensor. Therefore, you should check whether you install it the right way or not after changing the sensor. When the installation process is incorrect, you will notice your car won’t start or stalling intermittently.

Also, the engine overheats immediately after starting or check engine lights come on. Inconsistent acceleration, late starting, engine misfires, rapid vibrations, etc. are other issues you will for faulty installation. Therefore, check the steps below and ensure whether you have been replaced this way or not. Take a look at this quick process:

Step 1:

Stop your car (if you drive recently) and let the engine cool for a while.

Step 2:

Disconnect the battery negative terminal and access the crankshaft sensor unit. Normally, you can find it bottom part of the engine. Where the crankshaft positioning sensor is located varies from vehicle to vehicle. Some vehicles have it in the starter motor. 

Note: Don’t forget to disconnect the negative terminal as the sensor is located in the electrical components.

Step 3:

After locating the unit, remove the retaining bolt. Then, take off the sensor from the attachment or its housing. Here you can use a short extension to complete the elimination process. After loosening the retaining bolt, use your fingers to take it off completely.

Step 4:

After removing the sensor from the housing, now is the time to replace it with a new one. Before that ensure you soak the new sensor in fresh engine oil. Don’t forget to soak the o-ring as well. It helps to get it into the car effortlessly and quickly.

Step 5:

You are now in the final step. Here you need to install the new one like the removal process. Set the new positioning sensor exact place, fitting the retaining bolt to the sensor. After that, tighten the retaining bolt. Finally, reconnect the negative battery terminal and check whether its function is right or not.

Task #2: Ensure Installing Crankshaft Right Location

This is another vital checking list after installing or replacing the crankshaft sensor. If you don’t install the sensor in the exact place where it needs to be installed, it can’t perform. Therefore, you should overcheck if you installed the accurate place or not.

Otherwise, it can lead the engine to face significant troubles and the entire system will be damaged. Also, you will face a delay in starting, poor engine speed, and notice a reduced RPM rate.

Task #3: Reset the Sensor

Another crucial and obligatory thing you should perform after replacing the sensor is resetting the sensor. It should be done if you notice there is a problem in starting. Does it sound weird why you should reset this as you just replaced the sensor?

If you notice the DTC trouble code (p0335) after replacing the sensor, you should reset the positioning sensor. Anyway, resetting can be done with two familiar methods–with a scanner and without a scanner. Resetting is necessary even though the engine performs well or delicately because there can be an issue in the ECU until resetting the unit.

Resetting with a scanner is easy and quick. It requires connecting the scanner to your car’s computer system and then further tasks should be done. In addition, there are several ways to reset the sensor without a scanner. Among them, acceleration and deceleration cycles and disconnecting the battery are well-known processes.

Task #4: Relearn Crankshaft Sensor

Next thing after resetting the positioning sensor, you need to allow the ECU to detect or relearn its presence or position. To do it, follow the below instructions:

  • Start the engine and ensure the engine oil and coolant has at the highest temperature.
  • Close the engine for a while so that it cools down.
  • Take your scanner and set “CASE Learn” to prepare the sensor for working.
  • Take a look at the transmission and check if it is in the park or not. If parked, start the engine.
  • Now, press the brakes and hold the pedal tightly.
  • After getting the engine to the idle state, check the trouble code.
  • You will see whether it indicates the CASE learned or not. If it has been learned, you are done with your job.

Task #5: Ensure car engines receive the necessary information

The Engine Control Unit (ECU) has a direct link to the crankshaft sensor. It helps to read the engine’s speeds (rotational). Therefore, it is easy to adjust the timing as soon as the speed changes. When you observe this ECU can’t recognize or react properly according to the speed changing, assume that there is a problem with the crankshaft sensor.

However, after changing the crankshaft or camshaft, ensure the car engine receives accurate information. If not, check the crankshaft sensor and fix the issue soon.

Task #6: Check the crankshaft position sensor signal or RPM signal

 The crankshaft positioning system has several functionalities. Among them, the first and most common function is to specify the crank’s position or RPM. When the engine control units work less on transmitting ignition and fuel injection timing, it indicates there is an issue with the cranks sensor.

Also, you will notice there is a change in the magnetic field. When the crank positioning sensor is bad, it can’t emit the continuous electromagnetic field. Lastly, check the crankshaft pin. Sometimes, the broken pin creates problems.


Crankshaft sensors do a lot to keep the vehicle running and engine performance right. Since it tells the computer system when drawing the spark and monitors the exact location. In addition, it sends valuable information to the ECU for better-operating conditions and performance. So it needs to be changed after detecting issues. But if you are wondering what to do after replacing the crankshaft sensor to get the most out of it, read this guide carefully. Hopefully, you clarify your thoughts, and doing it accordingly will help you out. Wish you a happy ride always.

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