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Q: My engine service light came on, and i hook up my Dianostic OBDII and code reads on 2003 Ford Expedition

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
diagnostic reads PO128, What do I need to do or replace. Thank you KP5205
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