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I guess I got worried when I saw the Chilton book suggesting that at least 4 of these sensors be replaced every 15,000 miles. I did actually go down and talk to a mechanic, he said it was the oxygen sensor, no worries unless you want to please the EPA. Thanks for your reply, Randall Ford (yes that is my real middle name)
Yeah, a faulty O2 will cause many more problems one is wanting to deal with. Get a code reader, verify what is going on and if possible, replace sensors with Motorcraft parts, not cheap knock offs. You can even check for cods with a paperclip if needed too for free.