A catalytic converter are used to reduce car pollution in many countries. They simply turn nitrogen oxides and carbon monoxide to nitrogen,carbon dioxide and water vapous (H2O)
There are 2. One in front of catalytic convertor and one behind the catalytic convertor.
No, it must be replaced.
No
After the catalytic convertor. Sensor one is before the convertor.
the catalytic convertor
My Chilton repair manual engine wiring schematic, for the 1996 Ford Explorer with a 4.0 L OHV engine shows 3 . Two are upstream (before the catalytic convertor) and one downstream (after the catalytic convertor - which is an oxygen sensor but is used to monitor the efficiency of the catalytic convertor)
Catalytic Convertor
half way down the exhaust
Bad catalytic convertor(s) is a possibility.
On the 3.0 L and 4.0 L there are 2 oxygen sensors at the front and 1 oxygen sensor (which monitors your catalytic convertor efficiency) at the back after the exhaust gasses have passed through the convertor. On the four cylinder engine - 1 oxygen sensor at the front - 1 oxygen sensor at the back (downstream of catalytic convertor - monitors catalytic convertor efficiency) Helpfull
It would be mounted in the exhaust pipe downstream of the catalytic convertor Helpfull
Diesels as a rule don't have catalytic converters. THey might have particle filters though.