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they are both on the exhaust after the cat and are both pretty easy to get to

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On a 1998 Lincoln Navigator :

Bank 1 is the passenger side of the engine

Bank 2 is the drivers side of the engine

Sensor 1 on both sides is closest to the engine ( upstream sensors used to help adjust the fuel ratio )

Sensor 2 on both sides is in the exhaust AFTER the catalytic converters ( downstream sensors , also called catalyst monitors )

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