How to Reset the Check Engine Light on a 2000 4Runner

by Patrick Warren
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old engine image by John Sfondilias from

The 2000 Toyota 4Runner comes equipped with a system diagnostic controller with a data link connector. The connector can be attached to an OBD II reader that will read OBD II codes that the system diagnostic controller provides. These codes correlate to different problems with the vehicle. When the 2000 4Runner's engine light comes on, it indicates that there is a problem with the 4Runner, generating an OBD II code to be read by a OBD II reader. The check engine light can also be reset with the OBD II reader.

Step 1

Turn the vehicle key to the "Off" position to make sure the 4Runner is completely off.

Step 2

Locate the data link connector. On the 2000 4Runner, the data link connector is located just under the dashboard in the driver side area, to the right of the steering column.

Step 3

Connect the OBD II reader connector to the data link connector. If the OBD II reader is self-powered, turn it on after making this connection.

Step 4

Turn the key to the "On" position, but do not start the 4Runner.

Step 5

Follow the OBD II reader's instructions to erase existing error codes. Different scanners will have different methods of doing this, from pressing an "Erase Codes" button to going through menu options to do so. This step will reset the system diagnostic controller.

Step 6

Disconnect the OBD II reader from the data link connector once the reader has indicated that it is through erasing codes.

Step 7

Start the 4Runner to verify the check engine light is no longer lit. If it is still lit, repeat the above steps. If it stays lit after repeating the steps, this could indicate a problem with the system diagnostic controller.

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