Is there two crankshaft sensor for 2001 Chevy Impala?

Yes, there are two crankshaft sensors for a 2001 Chevy Impala. One is located on the front of the engine, near the oil filter, and the other is located on the back of the engine, near the transmission bell housing. Both sensors are responsible for sending signals to the engine computer about the position of the crankshaft, which is necessary for the engine to run properly.