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O2 sensors

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Old 05-25-2018, 04:04 AM
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Default O2 sensors
Can anyone tell me which sensor is Bank 1 Sensor 2. I have looked at 2 different diagrams. One says its the one before the cat, the other says the one after. All show I have 4 sensors when there are only 3 I can find. 04 blazer, 4 WD. The code is P0137. Thanks
 
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Old 05-25-2018, 12:01 PM
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https://blazerforum.com/forum/2nd-ge...-vortec-87215/
 
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