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

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 113,207 (89,321–149,000)
5 model years affected: 1992, 1997, 1999, 2000, more2005
8 people reported this problem
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
Viewing 1 - 2 of 2 comments
Were are the sensors. Located
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.