how do you read check engine code on a '91

[91silvernsx]

I'm trying to find out how to read the check engine light ---where & what device to you plug into a '91

thanx, dana

 

[nsxtasy]

Click here for the answer in the FAQ/Wiki.

And there's a diagnostic chart showing the procedure to deal with each code in the start of the Fuel & Emissions section of the service manual.