About 13 months and 7500 miles ago, my mechanic replaced the EGR Valve and Tube and cleaned the intake to solve the low airflow problem. Now I'm again getting an insufficient flow warning with my check engine light (code P0401). I noticed the light shortly after rapidly accelerating because of a short merge lane in temperatures around 90 degrees.
My main question is: Is there anything else that wasn't replaced or cleaned last year that could be causing the problem?
Also, I know Accords like mine have problems with buildup in the EGR system. But has anyone else experienced repeat problems with the EGR system within such a short timeframe?