How to Troubleshoot a Toyota Celica GT Check Engine Light

Written by alibaster smith
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How to Troubleshoot a Toyota Celica GT Check Engine Light
(Comstock/Comstock/Getty Images)

When there's something wrong with your Toyota Celica GT, and it has something to do with one of the sensors on the car, then your vehicle's check-engine light will come on. If you ignore this problem, you could seriously damage the GTs engine, fuel, or exhaust system. This could mean anything from a decrease in fuel economy to catastrophic failure of the catalytic converter if the problem is serious enough. Troubleshooting the check-engine light involves the use of an OBD--on-board diagnostic--scan tool, which is available at most auto-parts stores.

Skill level:

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Things you need

  • OBD scan tool

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  1. 1

    Pull down on the fuse-panel cover with your fingers to remove it and set it aside.

  2. 2

    Plug the OBD scan tool plug into the OBD access port to the left of the fuse panel.

  3. 3

    Turn the ignition key to the "II" position and turn on the OBD scan tool.

  4. 4

    Wait for the scan tool to display "OK" on the screen and then shut off the ignition.

  5. 5

    Press "Menu" on the scan tool and scroll to the "Stored Codes" menu. Then select "Stored Codes" and reference your GT's service manual to translate the fault codes.

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