Anyone ever test their car's carbon monoxide with a home carbon monoxide monitoring system? I took both my co monitors and put them in my detached garage and closed the doors and used my remote start to see what happens......After 15 minutes the alarms did not sound and the garage is only a small 2 car garage. I tested the monitors and they worked with the test buttons, but being in a closed garage worth the engine running, they did not sound.does this mean my engine is in top shape

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1990 190E 3.0L