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post #1 of 5 (permalink) Old 04-24-2019, 12:44 AM Thread Starter
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What sensor do I replace...bank 1 down stream?
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post #2 of 5 (permalink) Old 04-24-2019, 12:45 AM Thread Starter
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post #3 of 5 (permalink) Old 04-24-2019, 10:59 AM
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based on this schematic...
Bank 2, sensor 1 is the oxygen sensor by the oil dipstick.



https://www.enclaveforum.net/9-gener...ensor-1-a.html


so based on your question. bank 1, downstream,.... bank1 sensor 2.



So youd look at the exhaust manifold closest to firewall... and follow it down- till you see the 2nd sensor.

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post #4 of 5 (permalink) Old 05-04-2019, 04:14 AM Thread Starter
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Replaced 02 sensor bank 1 down stream #2 light finally shut off. Now back on. 🤔🤔🤔
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post #5 of 5 (permalink) Old 05-04-2019, 08:03 PM
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How do you know it was a bad sensor?
For me it was the catalytic converters. My Acadia was misfiring, but not setting codes for the misfires. My issue was carbon buildup on the direct injection valves. My scanner, also, showed elevated Long Term Fuel Trim.

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