Well i bought a downpipe from ZZ and now my cel is on and im wondering what i can do do disable the #2 02 sensor?? but wow good performance!!!

 

I think you can use an O2 simulator but I don't know that they make one for the Cobalt or if it is a generic thing to buy. Other options are to turn off the DTC with HPTuners or use a wideband that has a second analog output and use it to simulate a narrowband. Then blug it in to the narrowband plug.

 

HPtuners.

 

I take it this is without the cat...

and yes, HPTuners is the way