diagnostic code p0401 egr flow insufficent ? on 1998 Buick Century

diagnostic code p0401 egr flow insufficient making check engine light come on . what is the cause.

by in Blackwood, NJ on January 05, 2011
1 answer 1 comment
ANSWER by on January 05, 2011
usually a clogged vaccuum port in throttle body. if they are clear, the valve may be bad. have it checked to verify. Roy
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COMMENT by on January 05, 2011
THANK YOU I WILL CHECK THAT.