P0404 Code: Exhaust Gas Recirculation Circuit RangePerformance

Mazda6 - P0404 keeps returning even with new EGR - Had a P0404 fault code

Had my EGR valve replaced 4 weeks ago on MY15 CC D2 and since then had a check engine light in 3 occasions, fault code P0404 EGR Control Circuit Performance

p0404 P0404 is a EGR circuit code You most likely have an exhaust or intake leak which is why it's running rich Check the engine bay for soot or oil

p0404 For most makes and models of vehicles, a trouble code P0404 is the result of an improper reading from your exhaust gas recirculation valve