We had a check engine light (P0441 and P0455) on our 2006 Scion tC. It also failed EVap, Cata, O2 sensor not ready. Replaced the gas cap on this model, drove about 100 miles and bam! The Check Engine light is off and all codes are cleared and tested. I thought all of these gas cap replacement recommendations were voodoo magic, but it worked for us.
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