Question about 1999 Mercury Mountaineer
The o2 sensor is normally located on the exhaust downpipe near manifold make sure the correct socket or spanner is used so not to damage to the sensor unit.Be warned it is not an easy job to remove.... Good-luck...
Posted on Jan 02, 2013
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Posted on Jan 02, 2017
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Removal & Installation
WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
NOTE Allow the O2 Sensor to cool down before conducting the test. The O2 Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in reducing under hood temps quicker.
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