Sorry to assume you already had a multimeter in your possession, as well as some experience using one.
As an owner of 25-year-old cars using computerized spark and electronic fuel injection, I depend on such tools. They help me to avoid swapping parts to see what fixes things, but in your case, I believe you need to swap the AMM next. Eventually you will get familiar with the OBD if you keep the car. Each time you remove power to it (as in disconnect battery) you remove all memory from the electronic systems and OBD will read 111.
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Art Benstein near Baltimore
Down in the depths of our souls, we all yearn for a job where rubber stamps are used.
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