Ford Taurus | Mercury Sable | Ford Taurus SHO | 1986-2007Forum for discussion of the Ford Taurus, Mercury Sable and Ford Taurus SHO. Covers vehicle years: 1986-2007
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If the throttle body had a lot of carbon so does the upper and lower intake manifolds.
You can get NTK O2s on eBay for under $40 each. NTK is the OEM supplier of the O2s. I would not worry about the downstream O2. They do not affect engine performance.
One thing you missed - have the delaer flash the engine computer and download the latest update. I do this every time my dealer tells me there is a new update, and I average - no kidding - 24 city and 29.5 highway.