Hi and thanks for using 2CarPros. Com.
I have to be honest, it is easy to move or disconnect either of those two sensors. I am going to give you the directions for removal and replacement. Look over the directions and check wiring to the switch to see if something was damaged, disconnected, loose.
Here is the oil pressure switch:
2003 Chevy Truck K Tahoe 4WD V8-5.3L VIN T
Vehicle Â Engine, Cooling and Exhaust Â Engine Â Oil Pressure Sensor Â Service and Repair
SERVICE AND REPAIR
Engine Oil Pressure Sensor and/or Switch Replacement
J41712 0il Pressure Switch Socket
If necessary, remove the engine sight shield.
Disconnect the oil pressure sensor electrical connector (1).
Using J41712 or equivalent, remove the oil pressure sensor.
Apply sealant GM P/N 12346004, (Canadian P/N 10953480), or equivalent, to the threads of the oil pressure sensor.
Notice: Refer to Fastener Notice in Service Precautions.
See: Service PrecautionsVehicle Damage WarningsFastener Notice
Using J41712 or equivalent, install the oil pressure sensor. Tighten the oil pressure sensor to 35 Nm (26 ft. Lbs.).
Connect the oil pressure sensor electrical connector (1).
If necessary, install the engine sight shield.
The forth picture is the location of the coolant temperature sensor. You can see how changing plugs can disturb it. Check that, too.
Let me know if this helps or if you have other questions.
Images (Click to enlarge)
Wednesday, June 27th, 2018 AT 6:57 PM