Scan Gauge II
I purchased a device on the internet called a Scan Gauge II.
It plugs into the jack under the dash on the drivers side. It monitors a and will display any error codes in the computer.
I leave mine connected all the time as it provide other information as you drive, such as MPG, MPH, Water Temp, Gallons left in the tank, and more. I have a 2006.5 Optima, and this provides the information that the cars trip computer should have.
Mike
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