About Mercury Mystique
Mercury Mystique, as a mid-size sedan, was manufactured by Mercury from 1994 to 2000 to take place of Mercury Topaz. Mercury Mystique was highly spoken of its ride quality. During the life circle, it was available in Base, GS and LS trims.
EGR Valve: EGR (Exhaust Gas Recirculation) valve in your Mercury Mystique either opens to let gases into combustion chamber, or closes and stops them from entering. A worn EGR valve can cause abnormal emission.
Oxygen Sensor: The oxygen sensor, or O2 sensor, is designed to measure the volume of oxygen in a liquid or gas. Disproportional O2 can cause your Mercury Mystique higher emissions and slow acceleration.
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