You ultimately gain nothing, and your check engine light remains on constantly. If you're in a state which requires vehicle inspections, it will fail.
The check engine light will illuminate and you will fail an emissions test.
No, of course not.
Between oil filter and catalytic converter
Gas engine, yes.Gas engine, yes.
It will cause the check engine light to come on with no benefits.
Underneath the vehicle mounted between the engine and the muffler.
I believe there are ( 4 ) Bank 1 is the passenger side of the engine , sensor 1 is before the catalytic converter ( upstream ) and sensor 2 is after the catalytic converter ( downstream ) Bank 2 is the driver side of the engine , sensor 1 is before the catalytic converter ( upstream ) and sensor 2 is after the catalytic converter ( downstream ) The 2 sensors before the catalytic converter are used for air / fuel ratio for the engine The 2 sensors after the catalytic converter are called catalyst monitors
At the rear of the engine and the second one is in the middle infront of the muffler
On the exhaust pipe between the engine and the catalytic converter
It is located in the exhaust system right behind the engine.
On a Ford Expedition : Bank 1 is the passenger side of the engine Sensor 1 would be close to the engine BEFORE the exhaust enters the catalytic converter Sensor 2 would be in the exhaust AFTER it exits the catalytic converter
Look under your Ford and you will see the converter mounted just behind the engine.