1998 Mercury Mystique Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1998 Mercury Mystique
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1998 Mercury Mystique ProblemsCheck Engine Light Due to Plugged EGR Passage
The Check Engine Light can illuminate with codes due to the lack of EGR (exhaust gas recirculation) flow caused. This is commonly a result of a clogged passage in the intake manifold. To correct this problem, the EGR valve has to be removed and the passage cleaned thoroughly. Partial restriction of this passage can cause smog test failures for the NOx emissions without causing a drivability symptom.
Transmission problems are common in this model, often as a result of a failed front pump. The pump loses its ability to create hydraulic pressure, which an automatic transmission needs to function. A sign of front pump failure can be a whine type noise.
1998 Mercury Mystique QuestionsWhy is my heater blowing cool air? (1 answer)
Replaced the thermostat and checked the vacuum valve above the gas pedal. It seems to be working, but still no heat?
Out of nowhere, our A/C stopped working in our Mystique. Did some testing and then some research online and came up with replacing the blower motor. Did that and it's still not working. What else could it be? A/C & heat not working at all, no problems before today and the car has only bee...