Let's not forget about the Camshaft Position Sensor! This is another part known to fail without storing any fault codes. Sometimes, a bad cam sensor will actually throw a fault code for the Crank Sensor!. I've seen this happen many times.

The most obvious difference in the way these two parts fail is in the actual symptom. A bad crank sensor can cause an engine to stall without warning, or, simply crank but not start. A faulty cam sensor won't cause the engine to stall, but it will cause the crank/no-start condition.