Looking at the meaning of the codes as listed on this site most of the codes do look to relate to a possible problem with an O2 sensor or the associated circuit. Not sure if PO445 could also be related or maybe something else.
P1191 - Oxygen sensor heater circuit open circuit - downstream sensors Downstream oxygen sensor heater electrical - line break Yes
P0445 - Evaporative emission control system purge control valve shortcircuit Purge valve drive - short to ground Yes
P0141 - 02 Sensor heater circuit malfunction (bank 1 sensor 2) Downstreamoxygen sensor heater electrical - incorrect reading Yes
P0420 - Catalyst system efficiency below threshold (bank 1) Catalystgeneral failure - performance problem Yes
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