Ah, *combi* valve.
There is no EGR system on these cars. Last engine to get EGR was the 12v, which was phased out in 1998.
If leaking, it's just a matter of getting everything aligned right. If the two mating surfaces are not aligned, it will leak. Sealant might delay it, but eventual leak is inevitable.
Growing old is mandatory; growing up is optional.
2005 A6 Sedan Q 3.2 (wife's whip)
2003 S8 (Q Ship)
2000 A4 Avant Q 2.8 (daily driver)
1999 BMW M Coupe (clownshoe)
1980 VW Scirocco (mid-life crisis car)
1983 Mazda RX-7 (revolutionary sports car)
1999 Mazda Miata SSB (track beotch, no plate)
2003 GMC Yukon Denali XL (the anti-earth)
2004 Dodge Dakota (hey, at least it's stick and 4x4)