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P0446 result for diagnostic test on smog test on a 1999 toyota corolla . what can be done.

Vehicle: 1999 toyota corolla

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you can start by changing the gas cap.

there is a video on the link below that shows you what to look for/ replace. I know its for a toyota camry but it will still help 

https://www.autocodes.com/p0446_1999_toyota_camry.html

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