A number of components play a role in the operation of your Toyota Corolla's ignition system. The coils are one of these important parts that you want to make sure and keep in good condition. The ignition coils are attached to your spark plugs and generate an electrical current that is needed to power your spark plugs. This helps to start to combustion process. It's important that the ignition coils are operating efficiently, as the entire process can be affected if they aren't. If your ignition coils are wearing out, you might notice the check engine light coming on. The vehicle might hesitate when you're trying to accelerate. You might notice a decrease in fuel economy as well. If you're in need of new Toyota Corolla ignition coils, be sure that you're getting OEM ones made for your car. You can find a selection of them here on our site.