From under vehicle look at exhaust pipe from fire wall back just past the catalytic converter will see cylinder plugs with wires on top goung into exhaust pipe they are o2 sensors
http://www.carparts.com/details/Chevrolet/S10/Replacement/Oxygen_Sensor/1999/ARBP960914.html?TID=gglpla&origin=pla&gclid=COPcz8jRjc8CFUJZhgodEjMLpw How To Install Replace Upstream O2 Sensor Chevy S10 Blazer GMC Jimmy 4 3L
SOURCE: Oxygen Sensor on '99 Isuzu Trooper
The O2 sensor is on the engine side (up stream) before the catalytic converter in the exhaust pipe, it is barrel shaped about the size of a jumbo magic marker.
SOURCE: I need location of oxygen sensor on a 2001 town & country
ALL of your oxygen sensors are located i your exhaust system Your exhaust system starts at the exhaust manifold on the side of the engine and ends at the tail pipe by you back bumper. Your vehicle oxygen sensors are 4 of them there are two on each side of your exhaust the are actually screw into the exhaust they are like the nose of you engine to read how rich/lean the car is running. The are pretty simple to replace, they look kinda like spark plugs with wires attached to them the wires are usually colored white black and grey with plug connections on the end. To replace get a oxygen sensor socket and a ratchet and unscrew this socket can be bought at almost any auto parts place like auto-zone etc. Good luck and thanks for using FIX YA
SOURCE: where are the oxygen sensors located?
There will be one located before, and one located after the catalytic converter for each exhaust that you have
SOURCE: 2002 Toyota Camry oxygen sensor Bank 1 Sensor 2 location
go to manifold follow it till you find the downstream sensor there you go
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