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check engine light is on constantly

I have a PO421 code,should I change the lower oxygen sensor?

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3 Answers from these members:
afritz afritz
by afritz afritz Earned 974 community points in Automotive
June 16th, 2011
Answered in 8 minutes
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Manage My Life
by Manage My Life
June 16th, 2011
Answered in 38 minutes
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bikerbigpapa bikerbigpapa
by bikerbigpapa bikerbigpapa Earned 7,304 community points in Automotive
June 17th, 2011
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