The spark plug tester is an easy way to test your spark plugs. Spark plugs are often replaced when your engine has a misfires but usually it does not fix the problem so its better to just use one of these to check them.
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko