That would be an O2 sensor, it monitors the oxygen level in the exhaust and sends that info to the ECM (Engine Control Module).
"Cat back" does not include the catalytic converter.
USUALLY 2 ONE IS A SENSOR (IN FRONT OF CAT CONVERTER) THE OTHER IS A MONITER (AFTER CAT CONVERTER) THIS SENSOR monitersCATALYTIC CONVERTER EFFIcency
One is before the cat. converter and one is between the cat. converter and the exhaust mainifold.
in front of the cat converter
There are four. One above the cat/converter and one below each cat/converter. Follow the wires.
torque converter isnt a eletrical part its all mechaical
All cars made since 1975 in America have a catalytic converter.
If pieces of the broken cat are rattling around in there then yes. If this vehicle is a 1996 or later and the cat is broken the check engine light should be illuminated and the codes should point to a failed cat converter.
If your engine will just rev to about 2000 RPMs in park. your cat converter is plugged
You can't.
Legally, yes.
You have (4) O2 sensors of the (97 to 99) Two are in front of the CAT. (Catalytic Converter). and the other two are behind the CAT. (Catalytic Converter).