Bank 1 is the passenger side of the engine ( V6 and V8 ) in a 2001 Ford Explorer
Sensor 1 would be close to the engine before the exhaust enters the catalytic converter
Bank 2 is the drivers side of the engine in your Ford Explorer Sensor 2 is after the catalytic converter ( downstream )
The oxygen sensor is mounted in the exhaust down-pipe
On a 2001 Ford Explorer : The Mass Air Flow sensor is located between the engine air filter housing and the large diameter engine air intake tube
its is located downstream on the backside exhaust manifold
it is the upper stream o2 sensor before the convertor
behind the catalytic converter
It is the one after the catalytic converter?
In the Exhaust manifold at the front of the engine
The 1996-2001 Elantra's have two sensors the upstream and downstream the upstream sensor is located the exhaust manifold and the downstream is located behind the catalytic converter.
That is the oxygen sensor screwed into the downstream side of the catalytic converter.That is the oxygen sensor screwed into the downstream side of the catalytic converter.
daewoo lanos oxygen sensor is located at the front of the engine approx in the middle of the outlet manifold as enclosed pics confirm:
As far as I know, there are 4 oxygen sensors on a 2001 Hyundai Santa Fe. 1 upstream sensor and 1 downstream sensor located in the front manifold/exhaust and 1 upstream and 1 downstream sensor located in the rear manifold/exhaust.