p0340 showed while at emissions facility.No check engine light.No camshaft on my

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2002 Oldsmobile Alero. Just bought from individual. Seems to run fine. Maybe a little vibration while sitting at redlights. Tried to get tags. Emissions showed a code p0340 camshaft sensor position circuit. This is the 2.2L. It doesn't have a camshaft. There is also no check engine light. The emissions employee said the person we bought the car from may have removed a lightbulb or put tape over it so we couldn't see it. The speedometer doesn't work properly. Seems to be around 15 miles off. Using a gps speedometer app. Hazard light will click. And sometimes the turn signals won't work. Sometimes they do. I'm not a mechanic. My husband has some experience with diy car repairs. He thought the crankshaft sensor. But is second guessing himself because the car will start every time. Please help. This is a car that we bought for our 16 year old. He just got his license and can't get tags for his car so he can't drive it.