Oxygen Sensors
Mercury Mystique
Ford Expedition
Ford Expedition Eddie Bauer

1999 Mercury Mystique V6 has 4 O2 sensors. Where are they located - Front11 Rear12 Front21 and Rear02 What does front and rear relate to?



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Front and rear normally refers to in front of or back of the catalytic converter. All O2 sensors are located somewhere on the exhaust system. Just get under there and look for them.