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2005 Saab 9-5 2.2L with engine code P0160, how do I fix the code?

Vehicle: 2005 Saab 9-5 2.2L

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P0160 - O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)

Possible causes
- Harness or connectors (The sensor circuit is open or shorted)
- Front Heated oxygen sensor (Bank 1) may be faulty
- Fuel pressure may be faulty
- Injectors may be faulty
- Intake air leaks may be faulty
- Exhaust gas leaks 
 
P0160 Description
The rear heated oxygen sensor (or sensor 2), 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 2.

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 2 is not used for engine control operation.  

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