what is code p219 on 2005 Ford Expedition

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engine light is on
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There is a p0219; Engine speed over limit. It means the programming in the PCM is set to a RPM limit and your truck has exceeded that limit, Possible programming issue in the PCM.
p219 is what he wrote on the note he gave me when he tested it and said it was the o2 sensor. I couldn't find that either that why i asked here.
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