Engine Compartment/Exhaust System

Upstream O2 Sensor 2/1:

Upstream O2 Sensor 1/1:

Fig. 3 Upstream Oxygen Sensors:

The upstream O2 sensors are in the exhaust manifolds.

Fig. 4 Right Rear Oxygen Sensor:

Fig. 5 Left Rear Oxygen Sensor:

The downstream O2 sensors are in the exhaust system near the rear axle.