That seems to make sense. I did find the heat shield covering the exhaust on bank 2 just past the catalytic converter was bent up against the exhaust. When it pried it back the horrible rumbling noise stopped. So now I’m just dealing with the engine light and the fact that fiberglass has come out the tailpipe. No other symptoms however, drives normally. If anyone knows which muffler (main or rear) has the fiberglass roving give me a shout.