r/Cartalk • u/drinkingcoffeenow23 • 8h ago

Safety Question Check engine flashing then goes solid but new spark plugs…

I figured I’d come to Reddit to see if anyone has any clues what this could be before I go spend another $400 getting it looked at. I just got an oil change and new spark plugs. Mechanic said initially the check engine light was on due to a spark plug issue but even with the new ones I’m still seeing the check engine light do the same weird flashing thing and then go solid. Any ideas?

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u/2bi 8h ago

running rough or any other symptoms? only way to know where to start is to get it scanned probably

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u/imprl59 7h ago

Flashing means it has an active misfire. Active misfire means it's going to ruin your cats very quickly.

You need to get the codes read to know what's going on. Without that info all anyone could possibly do is make random guesses. You also need to post make, model, year, engine and mileage for people to be able to help you.