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2001 Buick Century Question: I got code p0401??

 

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chato 116, 3.1L V6, Potwin, KS, August 21, 2014, 18:00
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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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