The crankshaft position sensor is usually placed on the crankshaft near the main pulley. It passes on information, and as with any other component of the engine, when things begin going south, it needs immediate attention. Ignoring the symptoms of a bad crankshaft position sensor will result in rapid wear and tear of the various parts of the engine and will quickly lead to engine wear-out. Fortunately, warning signs of a bad crankshaft position sensor are easy for the driver to detect. Read through the following points and keep an eye out for any one of these warning signs.