My 1991, CIS, M104 passed NJ emissions test by running on 45% alchol. Then found the reason for the failure, the cats were empty because of age. Replaced them.

__________________

Present
1987 300SDL
1991 300SL
1990 560SEL
2001 ML320

Past
1969 200D 1979-82
1983 300SD 1984-85
1972 250C 1982-02
1995 S350 2011
1997 S320 2012