DTC P0401 EGR flow insufficient

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6
votes
3answers
531 views

After Replacing EGR valve and tube: repeat of code P0401 for 98 Accord V6

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 ...
2
votes
2answers
764 views

P0401 and P0122 on a 2005 Hyundai Sonata

Our car has the check engine light come on with a codes P0401 and P0122. The car seems to run fine. What sorts of things should we check?