Crankshaft sensor: function, service and price

A crankshaft sensor, also called a TDC sensor or speed sensor, plays a central role in the proper operation of your engine. In this article, you will find all our tips for the maintenance and repair of the crankshaft sensor. We share with you all the secrets, from operation to price changes.

🚗 How does the crankshaft sensor work?

A crankshaft sensor, also called a TDC sensor, position sensor, angle sensor, or even a speed sensor, tells the engine ECU about the position of the pistons in order to calculate the engine speed and thus determine the amount of fuel injected. In this way, the TDC sensor ensures the correct operation of your engine.

There are two types of crankshaft sensors:

• PMH inductive sensors: These crankshaft sensors consist of a magnet and a coil that create an electromagnetic field. Thus, when the teeth of the engine flywheel pass in front of the sensor, they create an electrical signal that tells the computer the rotational speed and position of the engine flywheel.
• Hall Effect PMH Sensors: these crankshaft sensors are commonly used in the latest generation of engines. Operation is similar to inductive sensors, except that it is performed electronically. Indeed, when a flywheel tooth of an engine passes in front of the sensor, the current is disturbed, causing a Hall effect. Hall effect sensors are more expensive but more accurate, especially at low revs.

👨‍🔧 What are the symptoms of the HS crankshaft sensor?

There are several symptoms that can alert you that your crankshaft sensor is faulty or completely out of order:

• Problems with ignition and starting;
• Engine that seizes;
• Abnormal engine noise;
• Repetitive wedges;
• The engine warning light is on;
• Your vehicle's tachometer no longer works.

If you are experiencing any of these symptoms, we recommend that you head to the garage to have your TDC sensor checked and checked. Don't postpone repairing your car, otherwise costly breakdowns will occur.

🛠️ How to change the crankshaft sensor?

Would you like to replace your vehicle's TDC sensor yourself? Don't worry, find now our complete guide that lists all the steps you need to take to properly replace the crankshaft sensor in your vehicle. Save on car maintenance by doing certain jobs yourself.

Required material:

• Toolbox
• Sunscreen
• Protective glove
• socket
• Candle

Step 1: Jack up the car

Start by using a jack to place the vehicle on the jack supports. Make sure the vehicle is on a level surface to avoid problems when operating it.

Step 2: Disconnect the electrical connector

Open the hood and locate the TDC sensor electrical connector on the engine. It is usually located on the terminal block next to the fan or coolant hose. Once the correct connector is found, unplug it. Do not hesitate to consult your vehicle's technical documentation if in doubt.

Step 3: Remove the crankshaft sensor.

Then climb under the car and unscrew the crankshaft sensor mounting bolt. Then you can remove the TDC sensor from its place.

Step 4: Install a new crankshaft sensor.

Then assemble the new crankshaft sensor in reverse order.

Notification: The location of the TDC sensor may differ depending on your vehicle model. Indeed, on some models, you will have to go through the hood and disassemble certain components in order to gain access to the crankshaft sensor.

💰 How much does it cost to replace the crankshaft sensor?

On average, expect between € 150 and € 200 to replace a TDC sensor in your garage. The part itself costs around 65 euros, but the working time quickly increases the bill as it is a long and difficult intervention. Please note that the cost of a crankshaft sensor varies greatly depending on the type of sensor (inductive, Hall effect, etc.). Feel free to compare the best car services near you to determine the cheapest and best rated by other internet users.

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