On early ODB2 cars, readiness IS an issue that can difficult to fix.
So much so that MB issued this bulletin

Attached Files

Drive cycles & readiness SI 2004.pdf (105.2 KB, 11686 views)

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator