passenger side on engine block behind starter there is one bolt holding it onto the engine block with a plug and wire pluged into it
its located in the distributor at the back of the motor.
The 2002 GMC Sierra: temperature sensor is located on the front of the engine. The sensor will be just above the thermostat housing.
behind the harmonic balancer
It is screewed in the engine block over by the starter.
The sensor is behind the front pully under the crankshaft. It's held in by one bolt and takes about 5mins to change.
On engine block
It is located on the tailshaft of the transmission, on the passenger side.
near the oilpan, on the side of the motor, towards the bottom.
Sensor 2 is the downstream sensor (after the catalytic converter). Bank 1 is the drivers side of the engine
The knock sensor is on the starter side of the engine. It is abut half way between front and back.
the knock sensors are located in the top of the engine block. The intake has to be removed to get to the sensors.
they are located under intake manifold The #1 sensor is located in the front of the engine and the #2 sensor is located in the back of the engine. Remember to replace the intake gaskets once you replace the sensor/s. The total time it took me to pull the intake and locate the bad sensor was about 6 hours. Hope this helps