[header] How to change spark plugs in a car [title] Locate the spark plugs in your car (refer to owners manual). [step] When you open the hood or bonnet of your car, you should see a bundle of 4-8 wires leading to different points on the engine compartment. The spark plugs are located at the engine end of these wires, under the plug covers that attach them. 
[substeps] On a 4-cylinder engine, spark plugs will be located on the top or side of the engine in a row. On an inline 6-cylinder, they are located on the top or side of the engine head.