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AnswerYou made the same mistake I did, and likely replaced a perfectly good egr valve.

The "Related Questions" below gathers together a ton of information about this secondary air / EGR / DPFE and other stuff related to the 401 trouble codes.

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Q: What else could be causing the check engine light to be on in a 2001 Mercury Sable that the code read that it was egr valve and have replaced valve?
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