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On a 1998 Lincoln Navigator :

Bank 1 is the passenger side of the engine

Sensor 1 would be close to the engine BEFORE the exhaust enters the catalytic converter

Sensor 2 would be AFTER the exhaust has passed through the catalytic converter

* sensor 1 is used to send a signal to the Powertrain Control Module / PCM for it to adjust the air / fuel mixture for the engine

* sensor 2 is also called a catalyst monitor

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12y ago

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