1998 Mercury Marquis oxygen sensor

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 1, 2008 at 4:52 PM
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