P0404 and P1404 came up when got emissions test done on Buick Rendevous 2004, what does this mean?

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P0404 and P1404 came up when got emissions test done on Buick Rendevous 2004, what does this mean?

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Carguy1 · Answer 1 · 2018-08-11T11:53:01+0000

HI there,

Both of these codes are related to the egr valve closed valve performance. Usually this means the egr valve may not be closed all the way or closing when it should be.

P0404 and P1404 came up when got emissions test done on Buick Rendevous 2004, what does this mean?

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