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I found my gas cap was loose, how long before the emission light goes off?

It looks like mymechanic forgot to put the gas cap back in the hole when he was fixing my car and I noticed it was out after the check engine emissions light came on. I was wondering how long it would take for the light to go off after I put the cap back in.
I have a 2005 Toyota Matrix
How do I disconnect the battery?

You can get it to go off right away if you disconnect the battery cables for a few minutes - that will reset the computer.

This entry was posted on Tuesday, October 20th, 2009 at 8:53 pm and is filed under engine emission. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

5 Responses to “I found my gas cap was loose, how long before the emission light goes off?”

  1. karma_credit_plan on October 21st, 2009 at 2:42 am

    It took my Sante Fe approximately 30 starts before it went off.
    References :

  2. shane_ashley2000 on October 21st, 2009 at 3:18 am

    it take what they call 2 trips. A trip is measured in miles, how many i dont know
    References :

  3. my68chevelle2003 on October 21st, 2009 at 3:27 am

    its doesnt. unhook the neg side of your batt for 2 minutes. or to tie to autozone and have them clear it.
    References :

  4. You can get it to go off right away if you disconnect the battery cables for a few minutes - that will reset the computer.
    References :

  5. wirelessexperts5 on October 21st, 2009 at 3:57 am

    It depends on the make/modle of the car. I had a KIA RIO that you had to take the car in to get the error cleared. But Kia’s are POS’s so I’m not sure with other cars
    References :

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