There are two.
four
there are 4 o2 sensors
2 upstream and 2 downstream for a total of 4 O2 sensors.
All the O2 sensors are threaded into the exhaust system at various points.
O2 sensors are always located on the exhaust system.
A 2002 Chrysler Town and Country has two oxygen sensors.
The o2 sensors on the 2002 Pontiac Grand Am GT are found screwed into the exhaust pipe. There are 2 of these on the 2002 Grand Am GT.
That vehicle has several O2 sensors and they are all threaded into the exhaust system at various points.
There are four o2 sensors on a montero sport.
how many o2 sensors on a ford e350 van 2003
Three, one after each head and one after the catalyltic converter.
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.