Too lean or rich codes that come back after some miles are often tracked to o2 sensors for long term fuel trim. I would replace the secondary o2 sensors (the ones after the cats) and see if that helps.
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Had a 2010 WRX- boy was it quick in a straight line, got a 2014 Z- man is she grippy in the corners-- then left the Z and later got a GTI, now back in an 09 racecar Z!
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