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Question About Oxygen Sensor Error

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I'm dealing with a 1993 ES300 and in the process of giving it a tune up I noticed that the pcv valve didn't

have a rubber grommet to snug into. So I put one in and two trips later the Malfunction light comes on and gives me two codes #21 & #28

both of which deal with Oxy sensor. So I'm wondering if anyone here can tell me what the connection is if any?

On a side note, whoever designed that plenum to hang over the back plugs like that should be taken out and shot, what a beast that was :o)


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