Can spark plugs cause engine light to come on?

The engine light on my vehicle is on and the engine keeps misfiring. Are my spark plugs to blame?

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Answer provided by
Lindsey Hoover
Answered on May 05, 2022
Sorry to hear about your vehicle! Corroded or dirty spark plugs can cause your engine to misfire, which in turn causes your vehicle to send a signal to its computer that something is amiss. When this happens, your check engine light will most likely come on.
You should check your vehicel’s spark plug and wires often because both are likely to get damaged from exposure to extreme hot and cold temperatures, engine chemicals like oil and coolant, and electrical stresses——all things that happen naturally over time.
Below we list some common warning signs that it may be time to replace your spark plugs:
  • Engine is misfiring
  • Engine is making knocking noises
  • Rough idling
  • Problems starting your engine
If your check engine light comes on and you’re unsure what the problem is, we suggest taking your car to a mechanic. They can inspect and diagnose the issue.
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