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which wires do u probe on oxygen sensor. there is a black, a gray and 2 white on 1990 Dodge Dakota

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
ones, i was told it should read about 300 millivolts at idle and 800 millivolts at higher rpms.
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