What does a Crankshaft Position Sensor do?

The crankshaft position sensor measures the position of the camshaft inside the cylinder head. From this information it can be derived by the engine's computer (ECU) which cylinder is firing. Together with the information of the camshaft position sensor the ECU can the adjust the fuel injection system and engine coil firing sequence accordingly, to achieve a continuously optimal combustion cycle.

How do you know there is something wrong with the Crankshaft Position Sensor?

When the 'Check Engine' light on your dashboard is on. When the engine won't start or cuts out during operation. When the engine misfires. When the engine runs rough (a rough idle for example). When the car's fuel consumption is higher than usual.

When should you consider a Crankshaft Position Sensor replacement?

As the sensor is located inside the crankcase it is especially prone to deterioration. It can be affected by oil or the significant temperature fluctuations inside the engine. The sensor can, eventually, fail completely, meaning that the engine's ECU is not provided with the information to optimise the combustion process. In turn this can lead to the fuel injection malfunctioning, preventing the appropriate amount of fuel to reach the engine to combust. It can lead the engine to misfire and run rough as well as cutting out or not starting at all. All leading to higher fuel consumption. For optimal combustion cycles in the engine it is therefore important to service the crankshaft position sensor as and when stipulated in the guidelines set out by your car's manufacturer. Professional and timely maintenance is essential to prevent further damage of other parts of the engine. Should you experience problems with a crankshaft position sensor, then it is advisable to have it inspected and, if necessary, have the sensor replaced.

What happens during a Crankshaft Position Sensor replacement?

The mechanic will read the ECU for possible fault codes related to the sensor. The mechanic will inspect the sensor and ancillaries. If necessary, the mechanic will replace the sensor. The mechanic will check the system and will test drive the car to ensure proper operation of the engine. If necessary, the mechanic will make adjustments.

How much does a Crankshaft Position Sensor Replacement cost?

The cost of replacing a crankshaft position sensor depends on your car and what parts your car's manufacturer recommends using for the replacement. Find out what you could save by having the crankshaft position sensor replaced by ClickMechanic, by selecting your car at the top of this page!

How does a crankshaft work?

The crankshaft is a vital component of a car’s engine, acting as the link between the pistons and the drivetrain. Its main role is to convert the up-and-down (reciprocating) motion of the pistons into rotational motion that ultimately powers the vehicle. This process works through connecting rods, which attach each piston to the crankshaft. As the pistons move up and down during the engine’s combustion cycle, they push on the crankshaft’s offset sections (called crankpins), causing it to rotate. This rotation is transferred to the flywheel, and from there to the transmission and wheels. Simply put, without a properly functioning crankshaft, the engine wouldn’t be able to produce or transfer the power needed to move the vehicle. What does a crank shaft replacement job involve? Crankshafts are typically replaced as a complete component. Since a crankshaft is a vital part of your engine, it is not a serviceable part on its own, and the entire unit must be replaced if damaged. There are some more advanced versions of crankshafts in modern vehicles, such as those used in engines with high-performance requirements, but in general, the process for replacement is similar. Replacing a crankshaft is a detailed repair that requires skilled mechanics, and while it’s often done in a workshop or garage, it can be performed at your location in some cases depending on the vehicle. The replacement job involves the following steps: Starting the Process: The mechanic begins by removing the engine from the vehicle and securely suspending it to provide access to the crankshaft. Careful Disassembly: Once the engine is in place, the mechanic will carefully disassemble it, removing any components blocking access to the crankshaft. Damage Inspection: The mechanic will then inspect the engine to assess the damage and determine the best approach for replacing the crankshaft. Crankshaft Removal: With precision, the mechanic will remove the damaged crankshaft from the engine block, ensuring no further damage occurs to surrounding components. Installing the New Crankshaft: A new crankshaft will be installed, ensuring it’s properly aligned and securely fitted to optimize engine performance. Reassembling the Engine: The mechanic will reassemble all parts that were removed during disassembly, ensuring everything is securely placed back. Reinstalling the Engine: The repaired engine is carefully reinstalled back into the vehicle, with all connections properly secured. Final Test: To wrap up, the mechanic will run tests to ensure the new crankshaft is functioning properly and the engine operates smoothly. How do I know whether I need a crankshaft repair or replacement? Here are some common signs that may indicate a problem with your crankshaft: If you hear knocking noises coming from the engine, it could be a sign that the crankshaft is worn or damaged, requiring attention. If the engine misfires or you notice a sudden loss of power, making it harder for your vehicle to accelerate smoothly, the crankshaft might be to blame. If the check engine light comes on, it may point to issues with the crankshaft or other related components that need to be inspected. Difficulty starting the engine or the risk of stalling, especially when the crankshaft is seriously damaged, are symptoms to watch for. If you find metal shavings in your engine oil, this is often a sign of significant wear or damage to the crankshaft. What does a ClickMechanic crankshaft replacement quote cover? Your crankshaft replacement quote will cover: * The cost of the new crankshaft * Travel to your location * Fitting of the parts * Disposal of the old parts (unless you request to keep them) * VAT (if applicable) * 12-month parts and labor warranty. Can the crankshaft be replaced by a mobile mechanic? Due to the complicated nature of a crankshaft replacement, it is typically carried out in a garage, as there is a variety of equipment required for proper completion of the job. If your car is drivable, ClickMechanic offers free collection and delivery for bringing it to the garage!

Crankshaft Repair & Replacement | Free Quote

Wajs Autos

Rating: 5.0 out of 5

29 Reviews

Mobile mechanic in Bradford , 25 years of experience

Been working in a garage for 25 plus years, done minor jobs to major jobs from bulb replacements to engine transplants , now going mobile,

“Wajid was great, arrived on time and completed the work fast and correctly and super friendly!”

SAM • 12th March 2026

Vauxhall Astra • Crankshaft (CKP) position sensor replacement

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How does a crankshaft work?

What does a crank shaft replacement job involve?

How do I know whether I need a crankshaft repair or replacement?

What does a ClickMechanic crankshaft replacement quote cover?

Can the crankshaft be replaced by a mobile mechanic?

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What does a Crankshaft Position Sensor do?

How do you know there is something wrong with the Crankshaft Position Sensor?

When should you consider a Crankshaft Position Sensor replacement?

What happens during a Crankshaft Position Sensor replacement?

How much does a Crankshaft Position Sensor Replacement cost?

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