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Imponte, yes, you can turn off the reporting on the rear O2 sensors via a tune safely. They are only used to measure catalyst efficiency on these cars, not for altering AF ratio.
Pyroguy, I don't find that all that surprising anymore. I have had 2 upstream O2 sensors fail on me on my car and it never threw a code. The second time one failed the sensor was completely dead, zero voltage. You would think major sensor failure would trigger a CEL, but I gave up on relying on the CEL. Now, any strange behavior in the way it runs and I scan it immediately and check trims and O2 behavior/speed.
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2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4, 7º overlap) on CamMotion 8620 core, BTR Platinum .660" Dual Spring kit w/titanium retainers, CHE bronze trunnion upgrade, stock heads milled @ .015, Melling HV 10296 oil pump, TSP 1-7/8" long tube headers (W/Catless Off-road Pipes), Corsa Xtreme 3" Catback, GPI Ported/Rod Mod Intake, Stage 2 Ported Throttle Body, Vararam OTR CAI, Mike Norris Gen 2 catch can + GM 1LE clean side separator, 160º thermostat - Megan Racing adjustable coilovers (lowered 1.75"), MRR M017 10/11" wheels-Tuned by Ryan @ GPI
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