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I would start with looking at items that affect BOTH banks, IE MAP sensor, low pressure fuel regulator, etc.
However, short term fuel trims DO give valuable information on what to expect of long term fuel trims, so that info could be helpful.
I wouldnt say O2 sensors simply because different upstream O2s control either side of the engine.
Are you getting a check engine light with P0172/P0175, or are you just tinkering with data?
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