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TWO REQUIRED BANK ONE SENSOR IS LOCATED IN THE BACK OF THE MOTOR. CLOSE TO THE FIRE WALL ON THE EXHAUST MANIFOLD. bANK TWO SENSOR IS LOCATED ON THE CATALYST TOWARD FRONT OF THE MOTOR. BANK ONE YOU CAN USE A OXYGEN SENSOR SOCKET AND A LONG EXTENSION, BANK TWO WILL REQUIRE A COMBINATION WRENCH (7/8) IN SIZE.
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Where is the O2 sensor located on a 2001 Buick Century?
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http://wiki.answers.com/Q/Where_is_the_O2_sensor_on_a_2000_buick_lesabre"
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