Check along the exhaust for loose wiring for the O2 sensors, It is possible the harness pulled free and the wire insulation is getting melted. I would also get is scanned with a dealer level tool to make sure there are no hidden codes (not all codes turn on the light).
The noise could be just about anything. Try to determine when it is the worst? Cold start? When fully warmed up? While in gear? While idling? Does it have to be moving?
Maybe shoot a video of it when you can hear the noise and give us a link?
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Tuesday, January 24th, 2017 AT 5:22 AM