all o2 sensors mount in the exhaust, normally with one mounted in the manifold, or somewhere in the exhaust pipe in front of the catalitic converter. the other one should be mounted either in the catalitic converter itself, or in exhaust pipe just behind it.
No. do you mean the front or rear o2? The front might be an A/F sensor. Big difference. But no, there isn't.
Yes, there are 2. Its an obd2 car all obd2 ( onboard dignostics 2 ) cars have 2 - 4 wire o2 sensors.
i have a 2001 f250 v10 only have 2 o2 sensors
To the best of my knowledge there is no O2 relay. Why would you think one is needed?
All O2 sensors are threaded into the exhaust system at various points.
oxygen sensors or O2 sensors
4
there are 4 sensors 2 in the front and 2 in the back
yes
TwoTwo
There are 2.
2 1 before the catalytic converter (more expensive one) and 1 after.