Pontiac Grand am 2002. Trouble code P0171?

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POST 1036

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Recetly my car started acting up after i had driven about 1 hour. Than the engine light came on. i plugged in my code reader and it pulled out the code p0171. It means bank 1 system to lean. How would i go about fixing this? i also have the code P0420 meaning catalysy system below threshhold bank 1. Would replacing my o2 sensors fix the problem or what? Any help would be great
 
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