Hi all. "The Service Engine soon" light came on my '03 Discovery, and I do not have an owners manual for the critter yet ( wasn't in the Rove when I got her).I would hope that it is seperate from the "check engine" light found on other vehicles. With that in mind, would oil, plugs, cap and rotor, air filter solve the problem, or am I missing something? Has 76.000 on the odo, so plug wires as well? Thansk in advance for the help.