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

Asked by for the 1997 Toyota Camry
clean EGR ports
1 more answer
Ports of EGR need cleaned.