Just behind the vibration dampner/main pulley on the front (passenger side) of the engine towards the top.
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Onh the front of the engine to the left of oil filter by the starter. This will affect your car and how it runs because this sensor and camshaft sensors are supposed to be synchronized
ABOVE YOUR POWER STEERING RACK LOCATED ON THE FIREWALL
The crankshaft sensor on the 1998 NISSAN ALTIMA is located next to the radiator side of the harmonic balancer
The upstream O2 sensor is mounted in the ehxaust manifold The downstream O2 sensor is mounted in the exhaust pipe after the catalytic converter
On a 1998 Cavalier, the IAT sensor is located in the hose connecting the air cleaner to the throttle body. The IAT is a two-wire sensor.
The coolant temp sensor screws into the thermostat housing. This is located where the top radiator hose connects to the engine.
The 1998 Montero Sport crankshaft sensor will be located on the rear of the engine. The crankshaft sensor is on the inside of the rear engine cover.
Replacing the Crank sensor on these engines isn't really difficult to do except that once done it must be calibrated which requires a scan tool to accomplish therefore it's a job best left to a professional. If not calibrated it can cause false misfire codes to be set.
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Right next to and somewhat behind the crankshaft pulley