A camshaft position sensor is to make sure that the vehicle you’re driving works efficiently. It helps to make sure that the camshaft and the crankshaft work in sync for the car to work. The camshaft position sensor is an extremely important part of your car. It helps measure the speed and position of the camshaft. So if it goes bad it can be extremely problematic for your vehicle. But if it does, it is always better to know the symptoms. One of the most common symptoms of a bad camshaft sensor is the fact that your check engine light will light up. Secondly, your engine will run extremely poorly causing several problems for the driver. Another symptom on the list is that the transmission will be very rough and there will be shifting problems. The last symptom is the fact that your car will give very bad gas mileage.