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I just had this happen to my Ford Taurus, what I've been told is that it is a malfunctioning PGR valve (something to do w/ exhaust). I visited an autoparts store and they had the part I needed for $120 and said it's a pretty easy install for someone who know's cars. Luckly the check engine light went off, which might have meant I had a clog that worked it's way out.

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Q: What does error code P0401 for the check engine light in acura mean?
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