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"Both types are listed by suppliers for this car. Why?"
In 1984, a late production change added the heated oxygen sensor and harness to power it. I believe the model year is sometimes referred to as 1984.7 -- something like that. It is an improvement both to function and longevity, so take advantage and replace the sensor with the same type, the three-wire sort.
All replacement harnesses for the LH2.0 harness include this improvement.
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Art Benstein near Baltimore
"Freedom is not worth having if it does not include the freedom to make mistakes."
-Mahatma Gandhi
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