Not sure. I know when my Avalanche had it'* exhaust work done a sensor was fried. Chevy dealer had to replace the sensor and clear the code.

It is possible it'* the sensor. But 2000+ are picky about the free flow cats. Some will trip that code. I will adjust the tune and correct it.

Ya thanks guys Dan will take good care of it. I'm dropping it back to him for the correction.
I'm just curious if the sensor is bad. I did not replace it. Although there was no light till about the second d day of driving after the exhaust work.

What cat did you put on?

Yikes. Not to sure. I'm accully embarrassed to say it'* a glass pk for now; just till the do w hiflo from zzp shows.

To be honest...

Man i want a edit button. 3 inch dp is what i ment. Im always on this smartphone.
Do you or anyone have a link to bluetooth obdii. I have torque app .just need to get bt.

So, no cat. Your O2 sensor is working fine.

This is the adapter I have. Flat out one of the best. I tried one of the cheep Chinese, and it didn't work well at all.

http://cgi.ebay.com/ebaymotors/PLX-K...item27bd46f78e

This seams a bit les money than an areoforce gauge, it appers to do almost the same.

And more. A aeroforce will give you 2 scans. Torque can do 6 on each screen. I believe the KR is now working on torque. Only thing the aeroforce does that torque wont is a CASE learn.

Yeah Torque is supposedly working good for KR now.

A high flow on any 00+ is going to set codes. GM wrenched down on the expected efficiency of the cat.

When I program for this, I ensure the low efficiency and all voltage/heater codes are taken care of as well.