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I got code p0401??

(2001 Buick Century)
in Potwin, KS on August 21, 2014
Fist it was codes p01401 n p0404 replaced egr valve n catalyst converter erased the codes and was fine for a few days but now I got code p0401???
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Popular Answer
on August 21, 2014
Definition and repair tips---- http://engine-codes.com/
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