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I'll check the header gasket. It is copper so there is a chance it would need retorqued, but I certainly don't hear anything. I'll plug the tailpipe and hook an air line into an O2 bung and to if I can hear any leaks.
The more I think about it the more I think the issue isn't with the O2. The fact that the slow response codes came back as soon as I unplugged the heaters tells me that the O2 is functioning fine. Once plugged back in it reads, drops the slow response codes and soon after sees a lean issue. I tested 2 difference sensors and they both acted the same way. We smoked the intake and there were no leaks. If I don't find any exhaust leaks I'll try a MAP sensor I guess.
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GX Coupe
Dropped and Blown
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