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Q: check engine light on 1999 Oldsmobile Alero

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
we have a 99 Alero v6 and the check engine light come on with P0171 what is the most coo mun problem in these matter
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