There are at least 5 different things that can cause that code on that model!
First thing, in the morning do you hear the AIR injection pump come on? should sound like a vacuum cleaner for a minute or so.
There is a vacuum switch-over valve that has to open 2 diverter valves & then inject air behind the exhaust valves. AT that point the O2 sensors MUST react to oxygen by dropping their output to less 40mv & stay there.
MANY scanners can ACTIVATE that system for that test!
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