How to Reset Car Check Engine Light

The check engine light is a warning light that appears on your dashboard when your car’s engine control unit (ECU) detects a problem.
The ECU monitors a variety of sensors throughout your car, and when it detects a problem, it will illuminate the check engine light to
alert you of the issue.

There are a number of different reasons why the check engine light may come on, including:

• Loose gas cap
• Faulty oxygen sensor
• Spark plug or ignition coil problems
• Catalytic converter issues
• EVAP system problems

While some check engine light problems are minor and can be easily fixed, others can be more serious and require professional
attention. If you see the check engine light come on, it’s important to have your car diagnosed and repaired as soon as possible to
avoid further damage.

How to Reset the Check Engine Light

In some cases, you may be able to reset the check engine light yourself. However, it’s important to note that this will only turn
off the light and not fix the underlying problem. If the check engine light comes back on, it’s important to have your car
diagnosed and repaired.

To reset the check engine light, you can follow these steps:

Method 1: Using a Code Reader

1. Purchase a code reader. Code readers are available at most auto parts stores and online.
   They range in price from about $20 to $100.
2. Connect the code reader to your car’s diagnostic port. The diagnostic port is usually located under the dashboard, near the
   steering wheel.
3. Turn on the ignition, but do not start the car.
4. Follow the instructions on the code reader to read the trouble codes that are stored in your car’s computer.
5. Once you have read the trouble codes, you can clear them from the computer. This will turn off the check engine
   light.

Method 2: Disconnecting the Battery

1. Warning: Before disconnecting the battery, be sure to turn off the ignition and remove the
   key from the ignition switch.
2. Open the hood of your car and locate the battery.
3. Using a wrench or socket, loosen the negative battery terminal (the black terminal).
4. Remove the negative battery terminal and wait at least 30 seconds.
5. Reconnect the negative battery terminal and tighten it securely.
6. Start your car and check to see if the check engine light is off.

Tips

• If you have a newer car, it may be necessary to use a code reader to reset the check engine light.
• If you disconnect the battery to reset the check engine light, you may lose some of your car’s settings, such as the radio
  presets and seat positions.
• If the check engine light comes back on after you have reset it, it is important to have your car diagnosed and repaired.