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O2 Sensor Circuit no Activity Detected

The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 3. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation.

Faulty Heated Oxygen Sensor Bank 2 Sensor 3
Heated Oxygen Sensor Bank 2 Sensor 3 harness is open or shorted
Heated Oxygen Sensor Bank 2 Sensor 3 circuit poor electrical connection

Check engine light
High Fuel Consumption
Excessive Smoke from Exhaust

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