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: 89,321 (89,321–89,321)
2 model years affected: 2000, 2005
3 people reported this problem
1 person shared problem details
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.
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