my 4.0 is under cover center of valve cover & removed coil & plugs is down in head. I have a 2000 3.0 S-Type. The left side is easy, just pop off the left side engine cover...remove the coils and the plugs are right there. The right side is a whole other matter completely, you need to remove the intake manifold to be to access them. It is a relatively simple job if you are even slightly mechanically inclined. Ensure you replace the upper intake manifold gaskets when you remove the intake manifold.
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