Bought a 2006 Honda Civic ex about a month ago, the check engine light came on and it was throwing code p0133 o2 sensor slow response?

Bank 1 sensor 1. Now I checked again and it's a P0171 code as we'll System Too Lean Bank 1 . My friend looked at it and said it's my oxygen sensor. Could that be the reason, and is that way it threw the other code as well? The car runs pretty good, does guzzle has a little.

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