scratching my head

[joep1234]

Took my wife's Q5 TDI in for a check engine light. My son scanned it last week before I took it in with VAGCOM and said that the was a code for EGR flow and MAP & MAF. Got a call from service writer saying the code was for a DEF code for the DEF controller. When I mentioned about the EGR codes, I was told that the codes that came from their scanner was correct but we must have used a generic scanner. I told him we used VAGCOM and he blew me off. Anyone have any idea how an EGR code would lead to a bad DEF controller?

 

[joep1234]

Was told that the DEF controller is in control for the emission system. It has been 2 weeks since the repair and all is good. Fingers crossed.

 

[Pittdawg]

Yes, DEF and EGR are interconnected. If no code has returned after two weeks most likely it is all good.

 

[joep1234]

Today is March 31 and still no problems, knock on wood. Over engineered but I love these cars.