Ken Ku, i assume that you have 2ZR engine, it is behind the Intake Manifold. so you need to remove it. then you will see a sensor with rubber hose that goes down to the area where the crankshaft is located.
check if you dont need to remove the intake manifold, because if you did, you may need to replace the intake manifold gasket, its up to you if want to reuse it.
