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O2 sensor bank 1 sensor 2 which o2 sensor


rgallant
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On A V6

Bank 1 is the passenger side

Bank 2 is the driver side

Sensor 1 is it he highest in elevation (the upstream sensor)

Sensor 2 is the lower in elevation (the downstream sensor)

'upstream' and 'downstream' being in relation to the flow of the exhaust gas before (upstream) or after (downstream) the catalytic converter

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