When I read that you have a 119 and it is running rich, it reminded me of something I read on Jim Forgione's site about DTC #19. http://pages.prodigy.net/jforgione/MB_S500.html
Maybe your car has not reached the adaption limit to set off the CEL, but it may be worth scrolling down towards the middle of the above link for some good information about DTC #19. Good luck.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
Last edited by emerydc8; 10-15-2007 at 05:12 AM.
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