I got code p0401?? on 2001 Buick Century

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???

by in Potwin, KS on August 21, 2014
1 answer
ANSWER by , August 21, 2014
Definition and repair tips---- http://engine-codes.com/