The car had 2 codes
P0491 and P0492
The first thing I checked was the egr valve, good and clean.
I removed the air pump and applied 12v direct. Found the motor tied up. I freed up the motor and it only ran another 5 minutes before tieing up again.
I will post pics as soon I resize them.

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2009 CLS550
2005 X5
2004 ML350
2002 X5
1998 323ic (sold)
1996 S320 (sold)
1991 190 (sold)
1989 300SE (sold)
1984 SD (sold)
1984 300D (sold)