However, the vacuum seal in the gas cap can get old or break, so you would have to replace your gas cap. With that, a common reason why your gas cap can trigger your check engine light is that you did not put the gas cap on properly after you refueled your tank.įurther, this is because the gas cap has a vacuum seal to shut the fuel tank tightly, but you can just put the gas cap on properly to fix this issue. Bad Gas CapĪll cars that run on gas will have a fuel filler cap or gas cap that keeps the fuel tank free of dirt, debris, and dust. So, if your fuel injectors have gone bad, there won’t be enough fuel moving throughout your cars engine, making your check engine light flash. Plus, some of these impurities can damage the fuel injectors, creating gashes or holes. Read More: Why Are My Windshield Wipers Not Spraying? (9 Reasons Why) However, the fuel that passes through these fuel injectors can contain impurities that will eventually clog the fuel injectors. That said, the fuel injector’s main purpose is to control how much fuel is sprayed during the cars intake cycles. Most gas-powered cars, especially ones that run on diesel, will have fuel injectors for the engine’s cylinders. Usually, you can have your battery recharged unless the battery is damaged and old, then you would have to replace the battery.Īdditionally, there could be an issue with your charging system that causes your check engine light to flash, not your battery.įor instance, the alternator that turns mechanical energy to electrical energy could malfunction, making your check engine light illuminate. Faulty Battery And Charging SystemĪ dead battery is another common reason your check engine light would appear since your car needs a battery to run. With that, your ignition coil will send little to no volts to your spark plug if it is faulty, causing your car to misfire and trigger your check engine light. Generally, high voltages are sent by the ignition coil to the spark plug to allow the spark plug to ignite the air and fuel within your cars combustion chamber. While your spark plug helps your engine start, an ignition coil is another important part of your engine that helps your spark plug work. Usually, you would have to have your spark plugs replaced since you cannot repair a spark plug. Read More: Why Was The Chrysler 200 Discontinued? (7 Reasons Why) However, a faulty spark plug will not create the spark needed to ignite the fuel and air, meaning your engine will not start while your check engine light flashes. Bad Spark PlugĪ spark plug is an important part of your car that helps ignite the mixture of fuel and air within your cars combustion chamber to create power. Therefore, if any of these sensors are failing, they will send the wrong information to your cars computer, leading to various imbalances that can make your check engine light flash. We did the research, and here is what we learned about the matter! Why Is My Check Engine Light Flashing?Ī common reason your check engine light is flashing is that you have an issue with your cars sensors.įor instance, the mass airflow sensor will measure the amount of oxygen that goes into your cars engine to ensure enough oxygen is combined with the fuel.Īnother example is the oxygen sensor, which checks how much unburned oxygen is in the cars exhaust.Īs such, these sensors are in charge of measuring the air in your engine and sending the information to your cars computer to create any necessary adjustments. If you noticed your check engine light flashing, you probably want to know why. However, one somewhat vague yet alarming icon to watch out for is a flashing check engine light. If you have a car, you know your dashboard has several icons that light up to signal that your car needs something.
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