Often tightening the cap is enough but the fuel cap might need to be replaced if the seal is broken. The reason why the check engine light comes on is because the car has failed some type of test.
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But I heard recently that Chevron was better and on my first tank last week after driving 20 miles that light has gone off and stayed off.

Why would my check engine light come on. The check engine light can come on for many reasons. For your cars engine to operate efficiently it requires a particular ratio of oxygen to gasoline. The light is off because the PCM moves the information about the fault to history and continues checking the problem.
Ive been running ARCO gas in my car. An illuminated Check Engine Light can be caused by several different components. Seemed always to be fine.
If the light begins flashing however it indicates a more serious problem such as a misfire that can quickly. Whether that is a continuous monitor like misfires or engine timing or non continues monitor like the catalyst or the EVAP system or air fuel ratio. A check engine light on a Ford Explorer sometimes indicates a simple problem such as a gas cap that needs tightening or something more complex and expensive such as a bad catalytic converter.
A cooling system concern can also illuminate the Check Engine light or set off your Check Gauges light. When a test fails the check engine light may come on. We start a new drive cycle and if the test that turned the light on does not run the MIL may turn off.
The next time the PCM runs the failed test the light comes back on. That kind of stuff. Then check that the vehicle is properly connected to the battery.
How to fix the check engine. Low level of any fluids Low oil coolant brake fluid etc Minor exhaust emission issues. Some vehicles have a check fuel cap warning or a Service Engine Soon light that may come on for the same reason.
It often requires a trip to the repair shop to diagnose the problem causing the warning light. Minor engine issues like a loose fuel tank cap. Here are some of the other common reasons that will cause the Check Engine or Service Engine Soon light to come on.
For example something as simple as a loose gas cap can trigger the warning. This does not suggest we have solved the problem. My check engine light has been on and off for a year and a half.
Automobiles have onboard computers that keep track of many. When you take your car to the mechanic he will test your cars battery before doing any further diagnostic testing. Check engine light on or flashing in your car what it means and if you should worry DIY with Scotty Kilmer.
And major problems such as failed internal engine components can turn on the light as well. Time for a scheduled service. Check engine lights come in orange yellow or amber depending on the manufacturer.
These problems can range from faults within the electrical system the engine fluid levels or to problems within the cars emissions system. First make sure the replacement battery is the right type for your vehicle. What to do when the Service Engine Soon light appears.
With a faulty battery theres bound be low voltage at the cars computer which may cause the check engine light to come on. Here are the causes of a service engine soon light. Reason 2 Faulty Oxygen Sensor.
The whole purpose of the check engine light is to illuminate whenever there is a problem. Ive been told that it is an 02 sensor awhile ago no money to fix it. You should also make sure that the battery terminals are clean though with the battery being new this shouldnt be an issue.
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