Were is the oxygen sensor on a GMC box truck?

Which O2 sensors came out of the vehicle an which did you put back in ? Two different types for that vehicle.

DTC P0134 or P0154 (w/LR4 and LM7 w/ Delphi HO2S)
DTC P0134 or P0154 (w/LR4 and LM7 w/ Denso HO2S)
DTC P0134 or P0154 (w/LQ4 w/Denso HO2S)

Single exhaust? Look before and after the converter. O2 sensors measure oxygen content before and after flow through the converter.

Rowland, Code p0153 Faulty oxygen sensor.
http://www.obd-codes.com/p0153
Code p1153 Probale faulty oxygen sensor.
PCM detect less than 55 lean to rich or rich to lean switches
P1153 OBD Trouble Code

Check the attached links,instruction and guides, Good luck
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Bank 2 is passenger side. Sensor 1 is the upstream oxygen sensor in front of the catalytic converter and sensor 2 would be downstream under the vehicle

I've never heard of an oxygen cam sensor

What kind of fuel sensor are you referring to?
If you mean the fuel tank level, it is usually in the top center of the gas tank.
There is usually an air sensor that tells the fuel injection processor how much fuel it should squirt, based on time, but it does not sense how much gas actually got squirted.
The oxygen sensor is sort of like a fuel sensor, in that if there is too much fuel, the oxygen sensor will read too low, and the system will reduce the fuel squirt volume. And the oxygen sensor is usually in the bottom of the exhaust manifold or the top of the exhaust pipe.

Hello gobabygo1, my name is JShreader. Thank you for choosing fixya.com.

There is 4 Oxygen Sensors on this model Truck. I uploaded a picture showing you exactly where each of the 4 Oxygen Sensors are located. It is in .pdf format. You can download it by clicking HERE. I hope this helps you. If you have any more questions or need any more diagrams, please don't hesitate to ask...Thanks again, JShreader!

you have four on this truck. bank one sensor one is "black and white" b1 s2 "brown" b2s1 "light green" b2 s2 "red/white" good luck post as fixed thanks

this is not due to the oxygen sensor some other problem i think better you check with a good mechanic