Question about Pontiac Sunfire

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I changed the air filter on my 2004 Pontiac Sunfire because of poor fuel mileage. Afetr I changed the air filter the check engine light came on. How do I turn off the check engine light?

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  • Pontiac Master
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Check to see if one of the wire harness has become un clipped from the intake tube like the IAT which would also give you a bad fuel economy if that has become un clipped. If there is a Auto Zone around your area, have them scan the car for DTC codes. Auto Zone scan free of charge and can help you understand why the check engine light has come on. Keep me posted, be glad to help.

Posted on Jun 22, 2009

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  • Master
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Most parts stores will have a scanner that can tell you what it is and reset the light.

Posted on Jun 22, 2009

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  • Master
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The check engine light came on from a code sent to your vehicles computer. If you take the vehicle to your local autozone, they will scan the code for you for free, and will also be able to reset it for you as well. You may need something more than just a air filter, and the code will tell you what it may be.

Posted on Jun 22, 2009

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Lots of things can cause poor fuel economy, but I am going to assume that you have had this vehicle awhile, and it is now getting worse mileage than before?

Check the cheap stuff first:low tire pressure can drop your fuel mileage, as well as carrying around extra cargo that you don't need. Do you have a check engine light on or any other symtoms of driveability?
A dragging brake caliper can cause bad mileage too. Your van won't coast very far , but should be a noticeable problem .

You could get a tune up too. a Bad spark plug or wires, fuel filter, or air filter all can help !

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