Ecu codes for 98 Honda civic?

Ecu code po401 for 1998 Honda civic

P0401 is the code for insuficient flow in the EGR system, checking the EGR system out including cleaning out the passages inside the intake manifold replace the EGR valve itself if needed will cure the problem.

The following link has the procedures, pictures and how to for the code:
http://www.tegger.com/hondafaq/egr-fix/index.html

Hope it help and send e mail if you need more help. HTH

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