Tag Archives: check engine light. check engine

Why is my “CHECK ENGINE” light on?

Why is my “CHECK ENGINE” light on?

Why is my “CHECK ENGINE” light on? “Why is my check engine light on?” I get this question almost daily. Since 1979, manufactures have put computers in cars, but still, every day, I'm asked to explain why a check engine (CE) light comes on. It’s a simple question, but requires a complex and lengthy answer however, we don't have time for that, so I'm going to try and make it a little easier to understand. I could write paragraphs of technical jargon, but in the simplest terms; Your car has a computer – actually, it has many…upwards of 20 or more. Your computer has one single way of letting you know how it’s feeling. We call it; the “Check Engine” (CE) light. If the light is off – the computer is happy (for the moment). If the light is on – the computer is unhappy (for the moment).   Not all CE light look exactly like this one, but this is the most common design.   ... read more

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