Trying to locate and replace ECM. on 2000 Saturn LS2

My mechanic told me I need an ECM.Is the (OBD 11)and (ECM) the same computer? If so where would it be located? Is it difficult to remove?

Asked by for the 2000 Saturn LS2
1 answer
OBD is on board diagnostic and ECM is engine control module. get a junk yard ecm