Nonetheless, there is a simple trick to turn off the check engine light. All you need to do is to turn the ignition on and off. Doing so resets your car’s electronic control unit. The only time the trick would not work is when the engine’s problem is severe to the point where a reset cannot fix it. This article expounds on the factors that If the engine is not running properly, the electronic control unit (ECU) logs the issue and sets a “pending” diagnostic trouble code (DTC). If the condition persists, the ECU sets a “hard” DTC and puts the vehicle in “limp home” or “open loop” mode. The system illuminates the CEL, which is also called a malfunction indicator Also, check the car’s gauges to see if there are any other glaring issues. Tighten the gas cap: A loose gas cap can trigger a check engine light. So be sure to tighten it completely. Just remember that it could take a couple of trips for the light to turn off. Slow the car down and pull over, if needed: If you see any visible issues like The check engine light is part of every vehicle that has an electronic engine management system, either an integral one or only for fuel ignition. Its function is to alert the driver about any type of engine problems. While driving, the computer of your MiTo (ECU o PCM) monitors air/fuel supply and exhaust gases in order to verify that the Common Causes for a Check Engine Light: 1. Loose Gas Cap. Something as benign as a loose gas cap can trigger your Check Engine light . That’s because the most common reason for a Check Engine light is from emissions system problems. Your fuel system is a pressurized system. The flashing light often indicates a misfire, which can cause damage to the catalytic converter. When this happens, the engine should be turned off immediately to prevent further damage. 1. Loose or bad gas cap. It is possible for the check engine light to come on in Sentra due to a loose or bad gas cap. Guys need help naman my car is a Avanza 1.3. Got idling problems which started last month, and then lumalabas ang check engine light nya. I did my research and mostly Idle Speed Control Valve ang sinasabi. Pumunta ako sa Shell Service Station and pinalinis ko yun ISC Valve, after ilang days lumabas ulit CEL and nagkakaproblem na sa idling ulit. Vacuum leak, hose, or gasket problems. Actuators or sensors sending bad signal to computer. Computer malfunction. Electrical short in a monitored circuit. Electrical connection problems, corrosion, or broken wires. A check engine light flashing prevents you of critical problems that will damage the catalytic converter. 2FBeW.