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Got a "check engine" light warning and the code reads P0137 Bank 1 Sensor 2 (O2 Sensor Circuit Low Volts). Is this the post-catalytic converter O2 sensor or the pre-cat? And are both pre/post cat. O2 sensors interchangeable. I was thinking of just changing both of them. Any help would be appreciated! Thanks in advance! God bless!
 

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Armed and Dangerous
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Thats the driver's side post cat I believe.
 
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