What is the exact code? If it's a 542 or 543, ignore them.
If you believe you have a fuel delivery problem, measure the fuel pressure. That is the only way you will ever find out besides guessing.
Replace the O2 sensor.
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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