what does a code po300 and code po021 mean in a nissan maxima

2005 NISSAN MAXIMA
170 MILES
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TERRIAKITTRELL
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I own a 2005 nissan maxima 3.5L v6 engine that has given me a code po300 and code po021. What is the problem?
Oct 6, 2012 at 6:03 PM
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