Nissan Altima: 1996 Nissan Altima, Sudden Noise from the Exhaust

Where did the plug come from? If it came from the wider part of the exhaust
that is located under the shift lever (rough location) it might be the O2
senson in the catalytic convertor. if that fell out you should get a check
engine light.

Thanks, you were correct. It was a O2 sensor. My catalytic converter
got rusted and it blew the O2 sensor. I had to replace the catalytic
converter ($200) + O2 sensor ($100) + labor $60 Total $360.
Did I get ripped off?.

bucksatan wrote: