What to do with a check engine light on and off situation? 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 under the driving conditions when the test is performed, but … Read More
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