Regarding the tail pipe and obdII scan, I do not know if those were tested. I am sure they were

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.

IMHO, the radio theory sounds ridiculous.

MIL = Malfunction Indicator Light. Does the "check engine" light work?

It is what the smog guys have been saying. Either they don't have a clue or they are thinking about a different make of car I guess. I don't know for sure if the indicator lights work or not. Is there a way to test them yourself? Thx

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.