Spark plugs are one of those maintenance items ... Misfires, especially, will usually trigger a check engine light, but other symptoms of a bad plug are often undetectable by a vehicle's onboard ...

It’s also possible for spark plugs to fail internally, if their electrical components stop working. When this happens, there ...

Spark plugs are one of those mechanical components that can easily be forgotten about, but they do need to be changed at some point. Here's how often.