It is the crankshaft position sensor (CKP sensor for short) not the "grank" "sersor" And the location varies with make, model and engine type and size, none of the info has been provided by you. Please use spell check or take a spelling course at a local adult night school.
Disconnect the wiring harness connector from the crankshaft position sensor by pulling the tangs on the side of the connector away from the plug and pulling the plug off the sensor.
Unbolt the sensor's retaining bolt, using the appropriate socket. Remove the sensor and its O-ring from the block.
Clean the mating surface on the block with a rag. Ensure that the new O-ring is on the new sensor. Install the sensor and tighten the retaining bolt firmly. Do not over-tighten the bolt, as you will damage the sensor.
Plug in the wiring harness connector, ensuring that it snaps into place.
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