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The 1980 doesn't store any error info as far as I know. First year you can talk to the brain is 87 with a upgrade to the 89 chips. The early cars you have to use a meter and actually measure the voltages at the sensors.
Early cars are also pretty simple, if its acting up, something is likely wrong. If you run down the symptoms maybe someone car sort out whats wrong or advise on which sensors to check.
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