Chevy 2005 impala codes P0401 and P1404

Question

my car failed emissions test. Diagnosis codes cited are P0401 and P1404

Answer 1

HI there

Both of these codes point to a faulty EGR valve or problem with the egr port being closed. Since the two are related you can treat them the same way. Here is some info that should help.

P1404 CHEVROLET - Exhaust Gas Recirculation Closed Position Performance

Read more: https://www.autocodes.com/p1404_chevrolet.html