96 Tahoe, codes 0172 and 0175

[BigDaddy13440]

As the title says, throwing two codes on my '96, banks 1 and 2 are running too rich. Recently installed a BlackBear tune with the EGR delete (my headers don't have an EGR provision), and a rear O2 sensor delete. Put in new O2 sensors in the front in June, shortly after I had the new engine dropped in (with the headers at the same time). Had a new FI spider swapped in last summer on the old engine, had the whole intake swapped onto the new engine.

Any thoughts, could the O2 sensors have gone bad already?

 

[SunlitComet]

You would have to monitor the O2 sensor outputs to see the behavior they have to determine if they are bad but I think you need to have blackbear review your tune and make sure they are aware of any change from stock made on your vehicle.

 

[BigDaddy13440]

You would have to monitor the O2 sensor outputs to see the behavior they have to determine if they are bad but I think you need to have blackbear review your tune and make sure they are aware of any change from stock made on your vehicle.

I specifically ordered the tune to delete the rear O2's, the EGR, and to have the speedo recalibrated for some 275/65/20 tires.

Now that you mention it, I did request that they set it for a CAI, which I don't yet have.... I suppose that would trigger the rich condition, as it's not yet getting enough air?

 

[SunlitComet]

possibly.