Behind the lowest pulley on the engine. This is the crankshaft. Remove the belt. Remove the tire on the passenger side along with the plastic coverings for the engine. Remove the bolt holding the pulley Use a pulley puller to pull the crankshaft pulley off. Remove the sensor on the right side if the of the shaft.
SOURCE: power loss
Can't answer your last question but catalytic convertors that are just not working anymore won't cause any loss of power.
However, if they have shattered inside (they are kind of a ceramic honeycomb) they can dump junk into the exhaust system that can eventually clog your muffler or resonator.
Checking whether this has happened isn't difficult; after the warm up of the engine, either you or a helper needs to listen to the exhaust note.
If firing of the cylinders is still distinct, the system isn't clogged with shrapnel; if it seems to hiss at higher RPMs, it is likely clogged.
This effect is easy to miss; I've had two failures and when cold, the engine would pull fine because the chunks of ceramic would fall to the bottom of the muffler and glue together somewhat.
Once hot and agitated, they would clog the muffler and cause a severe loss of power but the idle would be OK.
A hill that I would normally pull at 70 MPH, I couldn't top at all; had to sit and wait for things to cool down before proceeding.
It also seems some engines appreciate a bit of back-pressure in the exhaust system because the car gained in mileage and pulling power for several thousand miles before the clog became critical causing the mileage to fall sharply along with the power.
SOURCE: crankshaft and camshaft sensors location in nissan altima 2003
You are incorrect sir. There is a very good Youtube video showing you exactly where it is that is how I changed mine. The Crankshaft is located behind the engine block below and around from the cam sensor which is easly spotted looking at the engine. The crankshaft is in a difficult spot but once you figure out where it is it's easy...ish hope this helps
SOURCE: crankshaft sensor on a Monte Carlo 2001 SS 3.8
3.8L Engine
To install:
It looks like this:
SOURCE: were is the crankshaft position sensor located on
ANSWER: CRANKSHAFT POSITION SENSOR - 4.7L V-8 ENGINE
REMOVAL
The Crankshaft Position (CKP) sensor is located at the right-rear side of the engine cylinder block CKP Sensor Location/Removal/Installation - 4.7L V - 8 Engine the cranks sensor is positioned and bolted into a machined hole in the engine block
Disconnect CKP electrical connector at sensor.
Remove CKP mounting bolt CKP Sensor Location/Removal/Installation - 4.7L V - 8 Engine
Carefully pry sensor from cylinder block in a rocking action with two small screwdrivers.
Remove sensor from vehicle.
Check condition of sensor o-ring.
INSTALLATION
Clean out machined hole in engine block.
Apply a small amount of engine oil to sensor o-ring.
Install sensor into engine block with a slight rocking action. Do not twist sensor into position as damage to o-ring may result
CAUTION: Before tightening sensor mounting bolt, be sure sensor is completely flush to cylinder block. If sensor is not flush, damage to sensor mounting tang may result.
Install mounting bolt and tighten to 28 N·m (21 ft. lbs.) torque.
Connect electrical connector to sensor.
SOURCE: picture/location of crankshaft position sensor 2003 nissan exterra
The location is in back of the engine on the top of the transmission
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