What needs to be turned off in my tune, I will switching to a y-pipe
with the cats gutted. Its a 99 Z-71 5.3l, cat back exhaust, ultimate pd intake, 03 injectors, 02 computer, and Finish Line 4l60e Level 5 tranny.

I have hptuners, can someone post me a quick howto or guide.

Thanks,

Brian

 

To turn off rear O2 sensors in HP Tuners:

In Editor > Engine Diagnostics > DTCs
set the following to 3 - no error reported:

Driver's side:
137 - HO2S Circuit Low Voltage Bank 1 Sensor 2
138 - HO2S Circuit High voltage Bank 1 Sensor 2
140 - HO2S Circuit Insufficient Activity Bank 1 Sensor 2
141 - HO2S Heater Performance Bank 1 Sensor 2
420 - Catalyst System Low Efficiency

Passenger Side:
157 - HO2S Circuit Low Voltage Bank 1 Sensor 2
158 - HO2S Circuit High voltage Bank 1 Sensor 2
160 - HO2S Circuit Insufficient Activity Bank 1 Sensor 2
161 - HO2S Heater Performance Bank 1 Sensor 2
430 - Catalyst System Low Efficiency

Copied from CPIG's Hptuner Vehicle Tuning Guide,

 

Thanks for the help..

Brian

 

your welcome. Just did a quick google search for it and there it was