code p0404 and check light flashing

code p0404 and check light flashing Flashing CEL is usually multiple cylinder misfire Sounds like your EGR might be causing a vacuum leak

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 code repair Code 404 is for a problem with the EGR valve circuit The valve may be open or closed when it should not be

p0404 P0404 code repair Code 404 is for a problem with the EGR valve circuit The valve may be open or closed when it should not be