Check Engine Light with codes PO442 and PO456?

2011 MERCEDES BENZ 300
100,000 MILES • 3.0L • V6 • 4WD • AUTOMATIC
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TALONLUVSWIFI
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Please let me know what these codes could be most likely (common causes) on this particular model and how to fix them. I scanned someone's vehicle and would like to solve it. It said evaporative emissions (small leak in bank 1) I believe. It's for a 2011 Mercedes 300. It would be nice to know if it's an easy fix.
Jan 13, 2023 at 7:04 AM
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