1997 Intrepid - Diagnostic Trouble Code

Hello Group:
I have the Service Engine Light on and am getting 2 codes... Does anyone know how I can narrow down and help me find a solution to the
following problem:
P0160 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
Any hints would be appreciated...
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