Check Engine Light Due to Failed Oxygen Sensor on Mercury Grand Marquis

One or more oxygen sensors may fail resulting in illumination of the Check Engine Light.

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Average mileage: 113,207 (89,321–149,000)
5 model years affected: 1992, 1997, 1999, 2000, more2005
8 people reported this problem
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Viewing 1 - 2 of 2 problem details
1999 Mercury Grand Marquis 149,000 mi,
Were are the sensors. Located
2000 Mercury Grand Marquis 89,321 mi,
The check engine light came on and the car runs rough on starting an accelerating and horrible gas milage. When checked came up oxygen sensors needed to be replaced.