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To many things that can cause the check engine light to come on. It could be as simple as a bad gas cap to a miss fire in your ignition system.
If there is an Auto Zone around your area, they scan for the DTC codes free of charge and when the issue has been addressed. The check engine light will reset if self after 3 consecutive start cycle if there is no oter issues.
Thank you for using fixya and good luck
PO455 is a large evaporative fuel leak. A bad fuel cap is ONE of the things that COULD be the problem. Fuel system cleaning only lightened your wallet. Reading your post is confusing. Did all this start AFTER the Valvoline Wallet Flushing? If so , they left something loose or disconnected. I would find a qualified repair shop to fix the problem, and if it has anything to do with what Valvoline did, make them pay the bill.
Sometimes It will set a Code and After its Corrected the Light Needs to Be Manualy Reset By DISCONNECTING the POSITIVE BATTERY TERMINAL for 30-60 SECONDS AND THIS WILL RESET THE LIGHT.
are you fueling car with key "on"? That will cause light to come on.
Disconnect battery for 1 hour and this will reset "keep alive memory" and clear codes from memory. Drive car for 10 miles so computer can relearn engine parameters. It may run rough during this period.
do not over fill.
check engine light will come on when the vent of the gas tank has gas in it. that is one of the sensor in the newer car since later part of 2005
you may have to reset the engine light. These cars are all computerized. Call the dealership and tell them that you had to replace the gas cap as it was faulty and caused your check engine light to come on. Ask them if they can reset the "computer" or if they can tell you how to do it (if that is possible).
Don't know if that will work, but my dad has been in the car business for over 35 years - I tend to listen to most the things he says......
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