An illuminated CEL or malfunction indicator light (MIL) warns you when your vehicle’s onboard diagnostic system detects a possible issue. However, there are scenarios where the light won’t turn off even after resolving the issue. Seeing the illuminated CEL can be annoying, especially since you know you’ve already fixed the problem.
The most common way to reset the MIL light is to reset the vehicle’s computer by disconnecting the battery and reconnecting it after 30 to 60 seconds. This is done by unscrewing the bolts on the battery’s negative terminals and disconnecting the cable.
If you don’t want to go down that route, here’s how to remove a check engine light:
Use a Scan Tool
You can use a scan tool to remove the CEL by clearing or erasing the logged trouble codes. This process involves plugging the scan tool into your vehicle’s OBD port located under the steering column. This port isn’t readily apparent and you need to remove a plastic cover. You can refer to your vehicle owner’s manual to find the port.
Once the tool is plugged in, you just need to start your vehicle and press the “read” button on the scan tool. You’ll see a series of letters and numbers, which are unique codes that correspond to definitions, which can be searched online. You should record all the codes to make the necessary inspections and repairs to your vehicle.
To clear the codes, you’ll just need to press the “clear” or “erase” button on the scan tool. After a short loading period, the codes will be cleared and you can turn off your vehicle and disconnect the scan tool.
Check Your Gas Cap
Sometimes, a cracked or loose gas cap can trigger a CEL. This is because fuel vapors can escape from the fuel tank, causing an error in the vehicle’s emissions system, which triggers the CEL. If the CEL illuminates after you’ve filled up a gas tank, there’s a chance this might be the problem. Properly screwing on the gas cap or replacing a cracked cap can fix a CEL.
Restart the Engine
Turning off the engine and starting it again can sometimes remove the CEL. Depending on the issue, it might take several restarts before the CEL turns off. However, if your vehicle has a problem, then there’s a good chance the CEL will persist.
Drive Normally
Sometimes, a CEL can turn off on its own after driving normally. This might be a sign that your vehicle has a minor and intermittent issue.
Frequently Asked Questions
Can I Ignore the CEL?
Yes, you can. However, ignoring the CEL has its associated risks. A CEL can be red or yellow. Sometimes, the light can blink. If the light is illuminated red or if it’s blinking, then you have a severe issue that needs to be immediately addressed. Ignoring these signs can permanently damage your engine because it might have low oil levels or misfires.
What Are the Implications of Ignoring a CEL?
Ignoring the light and putting it off can result in more engine or transmission-related issues, which will be more costly and time-consuming for you in the future. An illuminated CEL is also considered an obvious sign that your vehicle has an issue. Hence, your vehicle won’t pass an insurance inspection or emissions testing.
Is It Okay To Reset a CEL Yourself?
Remember that resetting the engine light removes the warning, but that doesn’t mean the issue is resolved. If you don’t have plans to resolve the issue, then you should reset the CEL at your own risk.
Will a Check Engine Light Go Off by Itself?
If you’ve successfully repaired the problem causing the CEL, then the light should turn off automatically after some time. The light should turn off after 10 to 20 cycles, where one cycle is the process of turning the vehicle on, letting it run for some time, and turning it off again. On some vehicles, the CEL can turn off after driving 50 or 100 miles.
Does the Check Engine Light Disappear After Fixing the Gas Cap?
If a CEL illuminates because of an unsealed gas cap, screwing the cap properly will turn off the CEL. However, the vehicle might take up to three or more cycles before the light is turned off.
The engine light is meant to tell you to have your vehicle checked. Sometimes, this warning can go away if the problem isn’t significant. If you want to remove the warning for your peace of mind, the best option is to reset the light by resolving the issues that are causing it.
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