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The torque should be around 12 to 18 ft/lb (16 to 24 Nm) on most engines. The settings for the Focus and the Escape are slightly different so work to about 15 ft/lb (20Nm) for both cars.
I had to do this last summer. First I went to Advanced Auto. They read the code for me. One of them was bad, but I went ahead and replaced both. I purchased a manual for the steps, two knock sensors and a gasket set. About 170 dollars total. You will also need a torq wrench in inch pounds. Take your time, keep it clean. Make sure you clean the manifold and engine head surfaces where the gasket seats. Use a non metallic scraper, and if need be solvent to loosen any old gasket material. I found that laying saturated rags on the head surface and leaving them set a few hours helped the most. You can also get the steps and torque specs from either Advance auto or Auto Zone(then you don't need the manual). Use patience when tightening the manifold bolts, you should torque them in the sequence given(in the manual or online) and you have to do it twice, first time at half torque, then the second at full torque. If you over tighten you can crack the manifold. Good luck Art LeDoux, Stillman Valley Illinois
I really doubt the knock sensor is the problem, check the connector 1st for water intrusion or oil, if u do replace it then u must torque it to the proper spec into the cooling system jacket of the block or it will set another code.
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