Re: Catalyst Converter Problem....
You can but o2 sensor cheaters to install after the cat which will tell the pcm everything is normal. If you need to pass a smog test you will fail though. I put them on my 98 Z71 pickup and they work great. Not positive if they are avail for the Hummer, but def worth it. With an open cat it will think your running rich and the pcm will pull fuel trying to correct, or unplug the post sensor and it will run in open loop
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