Malfunction Indicator Lamp (MIL) Illuminated, DTCs P0300-P0306, Engine Runs Rough (Inspect for Water Intrusion in Spark Plug Recess Area, Replace Spark Plug and Ignition Coil, Seal Ign Coil Bolt Hole)

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1. Observe the Misfire Current Counters parameter with a scan tool, in order to determine the affected cylinder(s). 2. Remove the air cleaner resonator and outlet duct. Refer to Air Cleaner Resonator and Outlet Duct Replacement in SI. 3. Disconnect the engine wiring harness electrical connectors from the affected ignition coil(s). Refer to Ignition Coil Replacement in SI. 4. Remove the ignition coil bolt(s) and ignition coil(s) from the camshaft cover. Refer to Ignition Coil Replacement in SI. Note: If water is observed in ANY of the spark plug recess areas, then it will be necessary to apply Loctite® 565 PST Thread Sealant* to ALL of the ignition coil bolt hole vents and bolt threads. 5. Inspect for water intrusion in the spark plug recess areas. Warning: Wear safety glasses when using compressed air, as flying dirt particles may cause eye injury. 6. If any water is present, then remove the water from the spark plug recess areas with low pressure air. 7. Remove the affected spark plug(s) from the cylinder head. Refer to Spark Plug Replacement in SI. 8. Replace ONLY the affected spark plug(s) with new spark plug(s) as needed into the cylinder head. Refer to Spark Plug Replacement in SI. 9. Fill the bottom of the ignition coil bolt hole vent with Loctite® 565 PST Thread Sealant* as indicated in the illustration, and apply it to the ignition coil bolt threads also. 10. Replace ONLY the affected ignition coil(s) with new ignition coil(s) as needed. Refer to Ignition Coil Replacement in SI. 11. Connect the engine wiring harness electrical connectors to the ignition coil(s). Refer to Ignition Coil Replacement in SI. 12. Replace the air cleaner resonator and outlet duct. Refer to Air Cleaner Resonator and Outlet Duct Replacement in SI. 13. Clear the DTCs with a scan tool.