3 people reported this problem
P04021 Code re: EGR Insufficient Flow on Acura TL
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No need to replace the EGR Valve when this code appears; the valve itself is still good. The code appears because the flow is insufficient. Clean out intake manifold as shown here: http://www.youtube.com/watch?v=bOnoJFiwDKw
1999 Acura TL - 3.2L V6 77,000 mi, Visitor
Fixed once code still comes up