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Camshaft Position Sensor
What is a Camshaft Position Sensor and where is it Located?
Your vehicle’s camshaft position sensor, commonly abbreviated and referred to as a cam (position) sensor, cam angle sensor (CAS) and sometimes even CMP sensor, is a key component to your engine's ignition timing system. It is typically used on vehicles equipped with direct ignition (distributorless). The camshaft position sensor is connected to the camshaft. As the camshaft rotates, the magnetic element inside of it rotates and creates a series of electrical pulses. The camshaft sensor detects these and gives a signal to the vehicle’s Electronic Control Module or computer to let it know the position of the engine’s camshaft. Most cam sensors are hall effect or optical sensors, though some earlier versions were mechanical, driven by a gear similar to a distributor
The camshaft (or camshafts, depending on your engine’s design) rotates to open and close the intake and exhaust valves in order to bring in the air/fuel mixture to the piston located within each engine cylinder in order for them to fire. Information about which valves are open (i.e. the postion of the camshaft and which piston/cylinder is being used) helps the computer activate the fuel injectors and spark plugs at the right time. This ensures the engine is running in the correct firing order and with good timing.
Some engines may have two or more camshaft position sensors, one for each camshaft. Others may use only one sensor regardless of the number of camshafts. The camshaft sensor is usually located at either end of the engine cylinder head.
How do I Know if my Cam Sensor Needs to be Replaced?
Since the cam position sensor’s role is to supply information for the engine’s timing and firing systems, failure of the sensor can lead to problems with these systems. Without knowing which valves are open or exactly when they are opening and closing, the computer cannot operate the fuel injectors and spark plugs at the right time. This can lead to all kinds of engine trouble.
For example, the engine may misfire, sputter, or run roughly. It may also struggle to accelerate or stall during acceleration. The engine may also take longer to start, especially under cold conditions. In the worst case scenario, the computer may not activate the fuel injectors at all and the car simply will not start. If the problem reaches that point, a replacement camshaft sensor will be strictly necessary.
Before it gets to that point, though, your check engine light will likely come on. For camshaft sensor problems, a diagnostic scan tool will show codes between P0340 and P0349, shown below.
OBDII Check Engine Codes related to Camshaft Position Sensors
P0340 Camshaft Position Sensor Circuit Malfunction
Can I Replace a Camshaft Sensor Myself?
The difficulty of replacing a CMP sensor will vary with the design of your engine and the location of the sensor. Removing and installing the sensor itself will not prove too difficult. You may have to remove other parts, such as air intake components or the timing cover, to access the sensor. This, of course, makes the job more labor intensive.
Need a Camshaft Position Sensor Replacement?
Without a properly functioning cam sensor, your vehicle’s engine is not going to run as efficiently, thereby decreasing its overall performance. So it’s important to seek out a replacement camshaft position sensor as soon as possible if it has failed. Luckily, we carry a large selection of cam sensors here at 1A Auto, and for many makes and models. It’s just what you need to get your vehicle in good running condition again!
At 1A Auto, we make shopping for a replacement camshaft position sensor for your car, truck, SUV or van easy - we're here to help you select the right part for your vehicle! Call our customer service toll free at 888-844-3393 if you have any questions about our cam sensors, warranty, compatibility or to purchase, or you can buy online.
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