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In the 2013 Kia Optima, you can locate the crankshaft position sensor behind the engine near the camshaft area, tucked slightly behind the timing belt cover close to the crank. This part can be a bit expensive, with the Duralast brand sensor, identified with part number SU9164, priced at around $74 at Autozone. Replacing it is a fairly straightforward process - you just have to remove the bolt connecting it to the crankshaft, disconnect the engine wiring harness, and install the new sensor. Signs of a failing crankshaft position sensor include engine stalling or failure to start, poor engine performance, and reduced fuel efficiency while running.
The crankshaft position sensor for the 2013 Kia Optima can be found behind the timing belt cover near the crank.