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Update:
I just came back from looking at the problem. It's a pretty big problem in my opinion.
So the rear o2 sensor is cross threaded. Need to replace it. The rear o2 sensor is real loose and you can take it off by hand without screwing it out.
These leads to all the codes. Running to lean, since there's an air leak at the o2 sensors and as well as a rear o2 sensor low voltage since the sensor is barely on the headers.
I just don't understand, if they knew the bung was stripped, they should've just tapped/chased it and screwed it. Not forced it. Now I have to buy a new rear o2 sensor and hope to God that it'll get fixed then. They just have to chase/tap the bung. I really don't know where to get the headers welded with new bungs.
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