OBDII Connection
What is the difference between the OBDII connection underneath the driver's side dash and the one under the hood on the passenger side. I was thinking of buying the basic OBDII reader at Autozone which fits the connection under the dash. My mechanic tried to read the codes from the connection under the hood but only got an error message. I asked later if the key had to be on the "on position, engine off" position. He said no.
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