190e smog test problem
300E Catalytic Converter Test
1988 300TE fails emission test and valve job
Failed emmisions test!
My 93 190e 2.6 Failed the emission test, tech help
Lots of ideas in these threads. Many point to a worn out cat.
One simple trick that might help is to first drive the car on the open road a fair distance - get it good and hot, then take it straight in to the testing facility. Try to be the first one in line.
Fully warmed up engines supposedly run a little cleaner.