Can I clear the check engine light myself?
The short answer is yes, you can often clear the check engine light yourself, but it's important to understand the underlying issue first. The check engine light is an indicator that your vehicle's onboard diagnostic system has detected a problem, and clearing the light without addressing the root cause may only provide temporary relief.
Understanding the Check Engine Light
The check engine light, also known as the malfunction indicator light (MIL), is a warning system in your vehicle that alerts you to a problem with the engine, transmission, or other components. When the light is illuminated, it means the onboard diagnostic system has detected a trouble code, which can be read using a diagnostic tool.
The trouble codes provide information about the specific issue, such as a faulty sensor, a problem with the emissions system, or a malfunctioning component. Clearing the check engine light without addressing the underlying problem may cause the light to reappear shortly after.
Steps to Clear the Check Engine Light
Here are the steps you can take to clear the check engine light yourself:
- Diagnose the problem: Use an OBD-II (On-Board Diagnostics II) scanner or code reader to retrieve the trouble codes stored in your vehicle's computer. This will help you identify the root cause of the problem.
- Address the issue: Once you know the problem, you can take steps to fix it, such as replacing a faulty sensor, addressing an emissions issue, or repairing a malfunctioning component.
- Clear the codes: After fixing the problem, you can clear the trouble codes and turn off the check engine light. This can be done using the OBD-II scanner or by disconnecting the battery for a few minutes.
It's important to note that clearing the check engine light without addressing the underlying issue may only provide a temporary solution, as the light will likely illuminate again once the diagnostic system detects the problem.
When to Seek Professional Help
In some cases, it may be best to seek the help of a professional mechanic, especially if the problem is complex or you're unsure of the cause. Attempting to fix a problem without the proper knowledge or tools can lead to further damage or safety issues.
If the check engine light is flashing or the vehicle is exhibiting other symptoms, such as reduced performance or increased fuel consumption, it's best to have a professional diagnose and repair the issue as soon as possible.
Will I pass emissions if I clear my check engine light?
You will definitely fail the test. After a reset the car must go through drive cycles to prove the operation of the emissions systems.
How to permanently turn off the check engine light?
You plug an OBD-II scanner tool into it and, in most cases, out pops a code that tells you what the problem is. The scanner also allows you to clear the vehicle's internal code, which is what triggered the check-engine light. Do that, and the warning light will turn off.
Will AutoZone clear the check engine light?
Bring your car to your local AutoZone and our friendly staff can perform the scan for you. And for any parts you need to correct the codes and clear your Check Engine light, we're here for you.
How many miles do you have to drive to clear a check engine light?
30 to 100 miles
To make sure the check engine light does not reappear, it's recommended that you drive your car 30 to 100 miles. This enables the vehicle's “Drive Cycle” to reset, as the various sensors need time to recalibrate.
Can AutoZone clear codes on car?
Bring your car to your local AutoZone and our friendly staff can perform the scan for you. And for any parts you need to correct the codes and clear your Check Engine light, we're here for you.
Can a check engine light go away by itself?
Will your check engine light turn off by itself? In most cases, successfully repairing the issue that caused your light to come on will cause the check engine light to turn off automatically—but only after 10 to 20 “cycles”.
Can you clear an engine code without a scanner?
Can I reset my car's check engine light without a scanner? Yes, you can reset it by disconnecting the car battery for a few minutes.
How to clear a check engine light for emissions?
Plug an OBD-II scanner into your vehicle's OBD port and reset it to clear the check engine light. Disconnecting and reconnecting your battery will restart your vehicle's computer and clear the light. Drive an older vehicle around for a few days after repairs. The light will go off on its own once the computer resets.
How much does it cost to clear a check engine light?
Diagnostic fees alone can range from $50 to $200, while repairs can cost anywhere from a few dollars for a loose gas cap to several thousand dollars for more complex problems. If you find yourself facing a check engine light, it's important not to ignore it.
Is it illegal to clear check engine codes?
Tampering with a check engine light—or any other vehicle diagnostic or warning system—and then selling the car can indeed be illegal, especially when it comes from a dealership.
