Jim,
You were right, Have been using your prom for months now..no more code 19. But I am still getting a code 26...I have searched all over my S500 (94) for this vacuum line that could be causing it...and I cannot find it...any help is greatly appreciated.

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1995 E300 Diesel
1994 E320
1999 C230K
1994 S500 W140
1990 300 SEL