First off I've had a bank one sensor code for months now. I replaced my down pipe with a zzp catless dp and replaced sensor, plugs, plug boots, and motor mounts. After about 5 days code never cleared even after resetting the cell. Today I took my car to get the cat put back on since the car was too loud and now its running weird. Every time I get into the throttle it boggs down and trys to cut out. Loss of power at low rpms. Like its flooding or something. All I have is a bank 1 responding too slow. I've drove the car all day every time I start it... Same thing. Cleaned maf. Looked for vac leaks. Can't figure it out. Didn't run like this before the cat was put back on. The cat is only 10 months old. Any ideas or suggestions on what to try next? 06 cobalt SS

 

What sensor on bank 1? Sensor 1 or 2

 

If it's sensor 1 it will affect the afr's and run rich

 

Its bank 1 sensor 1 upstream. I've replaced it and the code is still on. But it didn't start running like crap till the cat was put back on.

 

u replaced the one just behind the turbo or the one under the car on the downpipe?

 

On the Mani. Mines supercharged. I think I might have found the problem... I hope. I had a extension for the o2 on the downpipe after the cat to trick the computer. Then I put the cat on and didn't take the extension out. The pipe was also in a bind so when they welded the cat on they straightened the pipe out and it caused the o2 sensor to push up against the frame in return splitting all 4 wires open and shorting out on the frame. Took the extension out. Going to buy another o2 sensor now so I'll have 2 new ones at that point. Hope this solves my problem. It was surging all day yesterday also.

 

Still no luck

 

Now I have p0030, p0036, p0102 codes. I cleaned my maf yesterday and messed with the purge valve today. I'm lost here.I only had one code before for the bank 1 sensor 1 and now three different ones. Any ideas?

 

Ended up being a 10 amp emissions fuse from the shorted o2 wires. Glad it was an easy fix. Guess I got a new o2 sensor out of it. Lol