I have a generic Actron OBDII scanner. I can read live data like trim, O2 signal, coolant temp, MAF etc. It's not a fancy scanner but it does have live data capabilities. I assume the previous poster can see it too since he mentioned trim values. Maybe some OBDII scanners are so cheap that all you can do is read the code and nothing else?

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1972 450SL
1982 300D Turbo