2005 Hyundai Sonata Owner's Manual - Page 210

6 DO-IT-YOURSELFMAINTENANCE 12 G060C01NF-GAT Changing the Spark Plugs You will find it easier to change spark plugs if the engine is cold. Always change one spark plug at a time. This helps avoid getting the wires mixed up. 1. Remove the engine cover. (2) (1) NOTE: It is recommended that the spark plugs for 3.3L engines be changed by an authorized Hyundai dealer. 2. Using a clean cloth, remove any dirt that has accumulated around the base of the spark plug so it cannot fall into the cylinder when the spark plug is removed. G060C01NF G060C02NF 3. Remove the cover of the ignition connector with a flat-head screwdriver. 4. Pull the ignition connector key in the direction of (1). 5. Press the position (2) of the ignition connector key and detach the ignition connector by pulling it.