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Q: o2 sensors on 1996 Chevrolet Blazer

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I have a 4.3 in my chevy blazer and need to see where my o2 sensors are so i can replace the right ones. I have my admissions test that shows sensor1(2)sensor2 and sensor1(2) sensor 3 which ones is the right one that i need to change so i can just past my test.
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