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Hi! Welcome to JustAnswer. Thanks for coming! I'm Ron Z and I'll be helping you with your question today.
On the 5.4L engine setup, there are 3 oxygen sensors. One sensor mounted to the exhaust just below the exhaust manifolds, and one mounted behind the converter. Do you happen to have a p-code for an oxygen sensor? If so, I can better tell you which one you're looking for.
Hi! I noticed this thread was still open, so I wanted to check in and see if there was anything else I could do for you on this issue? Any other questions you had? Was there something you wanted addressed that I may have missed in my answer?
Click here for an image location view of the oxygen sensors on this vehicle: https://goo.gl/FY0uoY
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