Where is the crankshaft sensor located?

The crankshaft sensor, also known as the crank position sensor, is a crucial component in the engine management system of a vehicle. It is responsible for monitoring the position and rotational speed of the crankshaft, which is the main rotating shaft in the engine that converts the reciprocating motion of the pistons into rotational motion.

Location of the Crankshaft Sensor

The crankshaft sensor is typically located near the front or rear of the engine, close to the crankshaft itself. The exact location can vary depending on the make, model, and year of the vehicle, but it is generally found in one of the following areas:

• Front of the engine: The crankshaft sensor may be located at the front of the engine, often near the timing belt or timing chain cover.


• Rear of the engine: The sensor may be positioned at the rear of the engine, close to the flywheel or flex plate.


• Side of the engine: In some cases, the crankshaft sensor may be located on the side of the engine, near the oil pan or timing cover.

The crankshaft sensor is usually easily accessible, as it needs to be in close proximity to the crankshaft in order to accurately monitor its position and speed.

Importance of the Crankshaft Sensor

The crankshaft sensor plays a crucial role in the proper functioning of the engine. It provides the engine control unit (ECU) with information about the crankshaft's position and rotational speed, which is used to determine the timing of the fuel injection and ignition systems. This information is essential for the engine to run smoothly and efficiently, as it ensures that the fuel is injected and the spark plugs are fired at the correct times.

If the crankshaft sensor fails or provides inaccurate information, it can lead to a range of issues, such as rough idling, poor engine performance, and even engine stalling or failure. Therefore, it is important to have the crankshaft sensor inspected and replaced if necessary, as part of regular vehicle maintenance.

Can you replace a crankshaft position sensor by yourself?

Yes, you can replace a crankshaft position sensor yourself, but it depends on your mechanical skill level and your vehicle's specific design, as it can be challenging due to difficult-to-access locations and the risk of damaging sensitive components. If you are comfortable with car maintenance, you can follow the general steps of disconnecting the battery, locating and removing the old sensor, and installing the new one. 
Steps for replacing the crankshaft position sensor 
This video provides a step-by-step guide on how to replace a crankshaft position sensor: 57sScotty KilmerYouTube · Aug 25, 2011

1. Disconnect the battery: For safety, always disconnect the negative battery terminal before starting any work on the electrical system. 
2. Locate the sensor: Consult your owner's manual to find the sensor's exact location, which can vary by make and model. 
3. Access the sensor: This may require removing other components or working from the top or bottom of the engine, depending on the vehicle. You may need to jack up the car and use jack stands for safe access from underneath. 
4. Disconnect the old sensor: Carefully disconnect the electrical connector from the sensor. It's helpful to take a picture to remember the correct order for reassembly. 
5. Remove the old sensor: Use a wrench or socket to remove the bolt holding the sensor in place. Then, gently pull or twist the old sensor out. It's a good idea to have a new O-ring ready for installation. 
6. Install the new sensor: Place the new sensor in the same spot as the old one. If the new sensor came with a new O-ring, ensure it's properly in place. Some suggest lubricating the O-ring with a bit of engine oil before installation. 
7. Secure and reconnect: Reinstall the mounting bolt to secure the new sensor. Reconnect the electrical harness to the new sensor. 
8. Reconnect the battery: Reconnect the negative battery terminal. 

This video demonstrates how to remove and replace the crankshaft position sensor on a Ford Focus: 58sTRQYouTube · May 12, 2025
When to seek professional help

• If the sensor is in a hard-to-reach spot: Some vehicles have sensors in locations that are difficult to access, requiring more extensive disassembly. 
• If you lack the proper tools: You may need specific sockets, extensions, or other tools to complete the job. 
• If you are unsure of the process: Attempting a repair without the proper knowledge can lead to further damage to the engine or electronic components. 

What happens when the crank sensor goes bad?

When a crankshaft position sensor goes bad, the vehicle's computer receives incorrect information about engine speed and position, which can cause a variety of issues, including the engine stalling, difficulty starting, rough idling, and poor acceleration. A faulty sensor can also trigger the check engine light. In severe cases, it can lead to the engine completely refusing to start, as the computer won't know when to time the fuel injection and spark for combustion.
 

• Engine stalling: The engine may stall unexpectedly while driving, at idle, or during acceleration. 
• Hard or no start: The engine may crank longer than usual before starting, or it may not start at all, especially when the engine is hot. 
• Rough idling and misfires: The engine may shake or run roughly at idle because the incorrect timing for fuel and spark causes misfires. 
• Poor acceleration: The vehicle may feel sluggish and not accelerate smoothly due to the engine's performance being affected by improper fuel and spark timing. 
• Check Engine Light: A malfunctioning sensor will often trigger the check engine light on the dashboard. 
• Decreased fuel efficiency: The engine's fuel injection timing can be disrupted, leading to worse gas mileage. 
• Irregular RPMs: The tachometer may show erratic readings, with sudden jumps or drops. 

How much does it cost to replace a crankshaft sensor?

The average cost to replace a crankshaft sensor is between $200 and $400, but can range from $120 to over $500 depending on the vehicle. The final price depends on the specific car, the cost of the part ($26-$120 or more), and labor time (10 minutes to over 6 hours). 
You can watch this video to learn about crankshaft sensor replacement cost and labor: 59sPrecisionMotorsYouTube · Jun 26, 2023
Cost breakdown

• Parts: The cost for the sensor itself typically ranges from $26 to $120, but can be higher for luxury or specific vehicles. 
• Labor: Labor costs vary based on the time it takes to replace the sensor, which can be as quick as 10 minutes on some cars or up to 6 hours on others. 
  • Some sources estimate labor at around $45 to $180, while others suggest a wider range depending on shop rates. 
  • Labor rates can be $125 to $150 per hour, notes JustAnswer. 
• Total:
  • A low-end estimate for an easy access sensor replacement could be around $120, while a more difficult one could reach $500 or more. 

Factors that influence the final cost

• Vehicle make and model: The year, make, model, and engine size all affect the part price and labor time. 
• Sensor accessibility: If the sensor is hard to access, it will require more labor time and therefore increase the total cost. 
• Shop rates: The hourly labor rate can vary significantly between different shops. 

How do I reset a crank sensor?

Park your vehicle or shift it to neutral and remain still for 2 minutes. Shift your car to part throttle and accelerate to 55mph. Drive around and maintain a speed of 55mph for 10 minutes to let your engine reach its operating temperature. Drive around at 55mph for 5 more minutes.