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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
Providing a complete model number to your question will definitely help an expert better your search. If you would like to reply to this thread with a complete model number included I would be more than happy to assist you. Have a great day.
by afritz afritz
June 16th, 2011
Answered in 8 minutes
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