Intermittent Error Codes 47C4 and 478E?

[woodfin3]

Thank you for your insight jrd1971vw.

[jrd1971vw]

It wound up being a bad low pressure EGR vacuum controller. Part # 11747805391

-jrd1971vw

[Badsmerf]

Where is this part located? How are the lines routed? I'm fighting the exact same thing now. I replaced the pressure converter that the egr vacuum line goes to. The diagrams for this system seem incorrect.

[ard]

Keep in mind that the vacuum diagram may be a 'schematic', and not a perfect depiction of the actual hose routings. I don't know for sure, just a comment....

[woodfin3]

I was wondering the same thing. Where is the pressure converter?

[Badsmerf]

Fixed! Someone had switched the hoses. The pressure converter is on the drivers side under the lip of the intake manifold. Tricky to see with everything attached.

[floor-it]

Wow thanks to y'all for this thread. Was exactly my issue from those codes. Had to go through taking off the intake manifold to see the part & replace it; what a terrible place to put the part.
Car is a champ again.
Saved $500 labor.
I ended up not bolting the part to the engine, and left it more outward so as to have easier access next time in case it breaks again; no need to take off the intake manifold again.