That engine has 2 of them and there underneith the intake manifold. You will have to remove the intake to get to them.
It's located in the distributor under the rotor.
In the font
The TSP sensor on your 2003 Chevy Tahoe is located on the back of the transmission.
The speedometer sensor on a 2003 Chevy Tahoe Z71 is located in the engine compartment. It is on the transfer case.
It is on the lower right hand side of the throttle body. There are 2 sensor on that side , it is the lower one.
The 4.9 vortec means that it is a 4.9 liter v8 probably.
That year did not have 1
It is screewed into the transfur case.
That year did not use one.
2003 chevy tahoe knock sensor
in the distributor located on top rear of motor
it is behind the starter. You will have to remove the starter to get to it.