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Number of O2 sensors?

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2 minutes ago, CamGTP said:

#1 reason I hate virtual flex fuel vehicles, once they start to up act it never really goes away. Can be running perfectly fine and then all of sudden it thinks there is 40% alcohol in the fuel.


I disable that feature on all trucks I tune that don't have a actual sensor installed.


I'm completely stock, no tune so kinda hard to disable.  That's sort of what I'm finding, one tank of fuel and it goes to some arbitrary %alcohol and never comes back down.


I've started another thread about 171/174...

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  • 1 month later...

can some one furnish me with the correct AC Delco part #'s for all four 02 Sensors. I can find 3 but the forth eludes me so I would like to start fresh with all the AC Delco OE/GM part #'s for my 2003 GMC 3500 4x4 with a 6.0 engine.


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Both upstream sensors are the same part number. The harness on them is usually always the same length and that's why it's easy to trouble shoot them because we can swap them side to side for testing sensors.


The rears will have different part numbers.


2131149 or 19209812

2133867 or 19209808


Those are the rear sensors, either number is correct for GM.



Is the front sensors.

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