How to Clear Error Codes on the Toyota Corolla

Written by katebo
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How to Clear Error Codes on the Toyota Corolla
You can clear the codes on your Corolla. (Andres Balcazar/Photodisc/Getty Images)

You can clear the error codes on your Toyota Corolla right from your home garage, saving yourself time and money. Corollas made in 1996 or later come standard with an On-Board Diagnostics II computer (OBD II), whereas earlier Corollas come with an OBD I computer. You will need to purchase or borrow an OBD I or II scanner to read and clear the error codes. Sensors are positioned throughout the Corolla that detect malfunctions and send this information in the form of error codes to the computer, which in turn illuminates a warning light on the instrument panel. The sensors also keep track of the regular maintenance needs of the car, and this is displayed on the instrument panel in the form of a service light. Do not attempt to clear the error codes until you have had the vehicle serviced or repaired. The lights will keep turning themselves on if you prematurely reset the computer.

Skill level:
Moderately Easy

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Things you need

  • OBD I or II scanner

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  1. 1

    Plug the scanner into the Diagnostic Link Connector (DLC) on the lower part of the driver's side dashboard near the bonnet release.

  2. 2

    Put the key into the ignition, and turn it to the "on" position. Don't crank the engine. The scanner will turn on automatically.

  3. 3

    Locate a command on the scanner that says "Erase Codes" or something similar. Select this command. Once the scanner has completed the task, it will display "Command Sent" or just return you to the main menu.

  4. 4

    Unplug the scanner, and start the engine. Verify on the instrument cluster that all warning and service lights have shut off.

Tips and warnings

  • Most auto parts stores will let you borrow their scanners for free for the purpose of retrieving and resetting the codes.
  • Scanner features vary a bit depending on the manufacturer.

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