What a camshaft sensor measures and why your engine needs one
A camshaft sensor is a small electronic device that watches the camshaft as it spins and sends that information to your engine computer. The camshaft controls when your engine's intake and exhaust valves open and close — precise timing that has to happen thousands of times per minute. Without accurate data about where the camshaft is at any given moment, your engine computer cannot fire the spark plugs at the right time or inject fuel at the right time, and the engine either runs poorly or does not run at all.
Most modern engines have at least one camshaft sensor, and many have two or four depending on the engine design. When one fails, you will usually see a check engine light, rough idle, hard starting, or a noticeable loss of power. Advance Auto carries replacement camshaft sensors for most common vehicles because they fail often enough that many drivers need one at some point.
Key Takeaways
- A camshaft sensor tells your engine computer where the camshaft is positioned so it can time the spark plugs and fuel injectors correctly.
- Advance Auto stocks camshaft sensors for most domestic and imported vehicles, organized by vehicle year, make, and model.
- You can find the right sensor by entering your vehicle information on the Advance Auto website or by visiting a store with your vehicle's year, make, and model.
- Camshaft sensor replacement typically costs between $150 and $400 in labor and parts combined, depending on how many sensors your engine has and where they are located.
- A faulty camshaft sensor usually triggers a check engine light and can cause starting problems, rough running, or reduced fuel economy.
How to find the right camshaft sensor at Advance Auto
Advance Auto's website has a parts finder tool that narrows down to the exact sensor your vehicle needs. Go to advanceauto.com, click the "Find Parts" button at the top, and enter your vehicle's year, make, model, and engine size if you know it. The system will show you all camshaft sensors in stock for that vehicle, usually with multiple brand options at different price points.
If you do not know your engine size or are unsure which sensor you need, you can also visit an Advance Auto store in person with your vehicle's keys or registration. Staff can look up your vehicle in their system and show you the correct part. Some locations also offer a free battery test and other diagnostic services, though sensor diagnosis itself usually requires a mechanic's scan tool.
Write down the part number before you leave or order, because camshaft sensors look similar to each other and part numbers matter. Ordering the wrong sensor wastes time and money.
What brands and price ranges Advance Auto typically stocks
Advance Auto carries camshaft sensors under several brand names, including Bosch, Standard Motor Products, Dorman, and Motorcraft (for Ford vehicles). Prices vary based on brand and vehicle, but a single camshaft sensor usually ranges from $40 to $150 for the part alone. Some vehicles need two or more sensors, which adds to the total cost.
Bosch and Standard Motor Products are the most common choices and tend to be mid-range in price. Motorcraft is the Ford factory brand and costs more but is often preferred by Ford owners. Dorman sensors are usually the least expensive option. All of these brands are stocked regularly at most Advance Auto locations, though availability can vary by store and region.
Advance Auto also runs sales and promotions throughout the year, so checking their website or signing up for their email list can save you money if you are not in a rush.
When to replace a camshaft sensor versus when to diagnose first
A check engine light is the most common sign that a camshaft sensor has failed, but that light can mean several other things too — a loose gas cap, a bad oxygen sensor, or a catalytic converter problem. Before you buy a new camshaft sensor, have a mechanic or an auto parts store read the diagnostic trouble code from your engine computer. Most Advance Auto locations will read the code for free using a scan tool.
If the code points to the camshaft sensor, you have a clear answer. If the code is something else, you will save money and frustration by fixing the actual problem. Some auto parts stores also offer a loaner code reader that you can take home and use yourself, which is useful if you want to check the code before deciding whether to visit a mechanic.
Camshaft sensors can also fail gradually, causing rough idle or poor fuel economy before the check engine light appears. If your engine is running rough and you suspect the sensor, a diagnostic scan is still the fastest way to confirm.
Installation: what to expect if you do it yourself or take it to a mechanic
Camshaft sensor replacement difficulty depends entirely on where the sensor is located on your engine. On some vehicles, the sensor is in an straightforward-to-reach spot and takes 15 minutes to swap out. On others, the mechanic has to remove the valve cover, timing belt cover, or other components to reach it, which can turn a straightforward part swap into a two-hour job.
If you are comfortable working on engines and your vehicle's sensor is in an accessible location, you can replace it yourself with basic hand tools. You will need to disconnect the negative battery terminal first, unplug the sensor's electrical connector, unbolt the sensor, and install the new one in reverse order. Check your vehicle's service manual or a repair guide specific to your model for the exact steps and torque specifications.
If the sensor is buried under other components or you are not confident working on your engine, a mechanic is the safer choice. Labor costs typically range from $75 to $250 depending on location and how long the job takes. Add the cost of the sensor itself, and total replacement usually falls between $150 and $400.
Ordering online versus buying in-store at Advance Auto
Advance Auto offers both options, and which one makes sense depends on your timeline. Ordering online and picking up in-store usually takes one to two hours, and you can reserve the part to make sure it is held for you. Buying in-store means you walk out with the part when ready, which is useful if you need it today or want to inspect it before paying.
Online ordering also lets you compare prices and read customer reviews before you commit. In-store shopping means you can ask staff questions about fitment or installation difficulty, which is valuable if you are unsure whether you can do the work yourself.
Advance Auto's website shows real-time inventory for each store location, so you can check whether the sensor you need is in stock before you drive over. If your local store is out of stock, you can order it for delivery to your home or have it shipped to the store for pickup.
Frequently Asked Questions
How do I know if my camshaft sensor is bad?
The most common signs are a check engine light, rough idle, hard starting, or reduced fuel economy. A mechanic or auto parts store can read your engine's diagnostic code to confirm whether the camshaft sensor is the problem. Do not assume the sensor is bad just because of these symptoms — other issues can cause the same signs.
Can I drive with a bad camshaft sensor?
You can drive short distances, but the engine will run poorly and may stall or fail to start. Continuing to drive on a bad sensor can damage the catalytic converter or cause other engine problems. If you suspect a bad sensor, have it diagnosed and replaced as soon as you reasonably can.
Do I need to replace all my camshaft sensors at once?
Only replace the sensor that has actually failed. If your vehicle has multiple sensors and only one is showing a fault code, replacing just that one is the correct approach. Replacing all of them at once wastes money unless they are all showing signs of failure.
What is the difference between a camshaft sensor and a crankshaft sensor?
A camshaft sensor watches the camshaft, which controls valve timing. A crankshaft sensor watches the crankshaft, which controls piston position and spark plug timing. Both are critical, but they do different jobs. Your vehicle has at least one of each.
Will Advance Auto install the sensor for me?
Advance Auto does not perform installations at most locations. However, they can direct you to local mechanics or shops that do. Some Advance Auto locations partner with nearby service centers that offer installation services for parts purchased at the store.