There are two, one on either side of the catalytic converter.
A 2007 Durango has four oxygen sensors.
any car after 1995 has two, or four oxygen sensors,as they use OBDII system
oxygen sensors are located just forward of your engine. In front of the engine is the catalytic converter. At the top at the bottom are your oxygen sensors.
Exhaust manifold(s).
The 4.7L 2002 dodge durango has 4 O2 sensors. ref. Chilton's Dodge Durango/Dakota 2001-03 repair manual. page 6-19 (Oxygen sensor - general info and replacement) The upstream oxygen sensor is located before the catalytic converter. The downstream oxygen sensor is located is located after the catalytic converter.
There are four total oxygen sensors. One before and one after the catalytic converter on each side of the engine.
The oxygen sensors on a 1996 Chrysler Town and Country are screwed into the exhaust system behind the engine.
The O2 sensors are screwed into the exhaust system. Follow the exhaust backward from the engine and you will find the sensors.
Oxygen sensors on a 1989 Toyota SR5 and located near the catalytic converter. The sensors read the emissions from the vehicle so the ECU knows ho much fuel to run in the engine.
There are two screwed into the exhaust on the rear of the engine.
The oxygen sensors on a 2004 Toyota Corolla are located within the exhaust manifold. They constantly monitor oxygen levels in the exhaust and allow the engine to make adjustments accordingly.
The oxygen sensors are screwed into the exhaust on the rear of the engine. The upstream is before the catalytic converter, the downstream is after.