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Ignition Coil "A" is for cylinder #1 (A=1, B=2, C=3 and so on...). On this vehicle, Cylinder #1 is on the side of the engine closest to the windshield, and the coil closest to the passenger's side (click here for image view). To gain the clearance needed to replace the ignition coil, the Upper Intake (aka Intake Plenum) will need to first be removed. Please remember to leave a rating using the rating system at the top of this page or accept the answer so I may be credited for this Q&A. You can ask follow-up questions any time, even after you rate or accept.