Posts Tagged: check engine light on and off

What to do when a check engine light turn on then off

You can look at history codes to see why the check engine light turned on, even if the light is off now What causes a check engine light come on and then go off? Your vehicle’s computers are constantly running tests on the various systems. These tests are referred to as Readiness Monitors or just Monitors. Some of the monitors run the entire time the engine is running. Those are called continuous monitors. Other readiness monitors are non-continuous. So a monitor may run tests and find that the system fails … Read More