I just received my registration renewal notice and it is directing me to a Test Only, or Gold Shield Station for a smog certification. I don't recall ever being sent to a Test Only or Gold Shield Station. I did not have to smog my 190 when I acquired it. Am I being directed this route because the car had previously tested as a gross polluter?

Also what should I do to prepare for the test? Additives, Plugs , ideas?

Thanks

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1993 190E 2.6 135k
1989 Ford Thunderbird SC 5 Spd 79K