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You left the gas cap off on your 2005 Scion Tc and check engine light came how do you reset it?

To reset the check engine light on your 2005 Scion Tc after leaving the gas cap off, you can follow these steps:

1. Make sure the gas cap is properly tightened and closed.

2. Start your Scion Tc and let the engine run for a few minutes.

3. Turn off your Scion Tc.

4. Disconnect the negative terminal of the battery for at least 5 minutes.

5. Reconnect the negative terminal of the battery.

6. Start your Scion Tc and let the engine run for a few minutes.

The check engine light should now be reset.

If the check engine light does not reset, you may need to take your Scion Tc to a mechanic to have it diagnosed and repaired.