i have a 1997 toyota camry the code that i get is po401 egr flow insufficcient, on 1997 Toyota Camry

i replaced the egr valve with a new one and its good for about 100 miles then it come back on what do i do

by in Apple Valley, CA on November 03, 2012
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2 answers
ANSWER by , November 03, 2012
clean EGR ports
ANSWER by , November 03, 2012
Ports of EGR need cleaned.