codes 141, 440, and 446? on 2001 Lexus IS300

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
need help fixing these codes cant pass inspection to save my life!!!
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Expensive as well? I was hoping to take care of the O2 sensor my self. Can you tell me what each code means, as far as the problem it represents? TIA
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