Don't let it go for too long. If you do, you risk having that extra-rich mixture ruining yout cats.
Lucky for you, the front sensor is easy. The rear one is a real PITA.
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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