2001 hyundai sonata 4 cyl how to check air flow sensor

2001 HYUNDAI SONATA
195,000 MILES
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RBOISVERT
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car hastates more when its cold, run fair,idle good
engine light on. Bank one lean.
Nov 16, 2011 at 7:06 PM
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RASMATAZ
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What is the actual code/s? P0171????????
Nov 16, 2011 at 7:52 PM