OBD CODE P0401 AND P0405

1998 Honda Passport

Electrical problem
1998 Honda Passport 6 cyl Two Wheel Drive Automatic 166k miles

The following OBD codes P0401 EGR Flow Insufficient Detected and P0405 EGR Sensor A Circuit Low causing my check engine light to stay on. I replaced the EGR valve and reset the computer but the same two message keep reappearing. I need help to detrmine other reasons that could cause these errors. Your help is greatly appreciated.
Ayman Alabed
August 7, 2008.

Check out the related content below while we wait for the question to be answered by a professional mechanic.