You will find a couple of reasons why the camshaft position sensor keeps going bad. One of the most common reasons are water damage, oil embedded in the engine, and wear-and-tear. Also, corrosion leads the camshaft position sensor to fail, and it becomes a common reason behind failure.  Another reason is the accident which also makes the camshaft sensor position bad. When you diagnose the failure, you have to replace that camshaft position sensor and associated items.  Not all the time, your camshaft becomes bad. But, sometimes, the oil leak caused by a defective, bad head gasket or loose oil cap may hamper the sensor’s signal.  Notably, the failure of the camshaft scanner sensor isn’t uncommon, and it may have been linked to other components of the engine.