How many O2 sensors are on a 05 grand caravan and where are they located?

There are two O2 sensors on a 2005 Grand Caravan and are located as follows: On 2.4 L four-cylinder engines, the upstream oxygen sensor is located on top of the exhaust manifold, above the flange. On 3.3L/3.8L V6 engines, the upstream sensor is located on top of the rear exhaust manifold, above the flange. The downstream oxygen sensor is located on the side of the catalytic converter on all models.