A defective O2 sensor will cause this fault. It is unlikely that the MILs would be responsible.
If the code follows the O2 sensor, you have your answer.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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