1998 Mercury Marquis oxygen sensor

1998 MERCURY MARQUIS
137,000 MILES • V8 • 2WD • AUTOMATIC
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JUA1487
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the check engine light is on and i already took it to the mechanic and told me that was one of the two top sensors,because it has two more sensors,so i replaced them and its still the same thing. what can i do.
Feb 2, 2008 at 12:52 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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