1999 RX 300 check engine light on

The check engine light is on and I had it scanned at the auto parts store- several codes came up stating that it is running lean in bank one, also insuffcient coolant temp for closed loop fuel control. Does anyone know what this all means? The car is running fine, actually getting better gas mileage. Am I doing damage by driving it?

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Susan P via CarKB.com
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