That depends on the engine, but they should all be either on the exhaust manifold collector or down the exhaust pipe a bit right after the exhaust manifold.
2
It appears that the 1993 Isuzu 3.2L V6 engine has just one oxygen sensor. It's a 4-wire type, located at the exhaust Y-pipe outlet. == ==
My Chilton repair manual - engine wiring schematic shows ( 2 ) heated oxygen sensors for the 1993 Ford Explorer
1 on the 2.2
Your Villager has only one O2 sensor located on the front catalytic pipe before the converter. You should be able to look down between the engine and radiator and see it.
The sensors are located on the transfercase for your cluster panel
1993 Honda Civic EX's dont have knock sensors.
It is located on the passenger side above the kick panel. With the glove compartment removed it can be seen to the right.
There are 2 heated exhaust gas oxygen sensors , 1 screwed into the outlet on each exhaust manifold on a 1993 Ford Ranger 4.0 L .
mine is not a sr5, which should be the same, has 1
Yes if the engines are the same
the O2 (oxygen) sensor on a 93 gmc is in the left down pipe of the exaust Y pipe