Ford XR3Z-9G444-HA Exhaust Gas Oxygen Sensor

On V6 models, both upstream sensors are screwed into the exhaust pipes right below the exhaust manifold flanges. On 4.6L V8 models, the left upstream sensor is screwed into the exhaust manifold above the manifold flange, and the right upstream sensor is screwed into the exhaust pipe below the manifold flange. On 5.0L V8 engines, the upstream sensors are screwed into each exhaust manifold above the manifold flanges.