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O2 Sensor: Description

Fig 1: Upstream Heated Oxygen Sensor 1/1
GC0021657Courtesy of DAIMLERCHRYSLER CORP.
1 - OXYGEN SENSORS
2 - EXHAUST MANIFOLD

The upstream oxygen sensor threads into the outlet flange of the exhaust manifold.

Fig 2: Downstream Heated Oxygen Sensor 1/2
GC0021658Courtesy of DAIMLERCHRYSLER CORP.

The downstream heated oxygen sensor threads into the system depending on emission package.