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Re: 2000 Alero 3.4 SES code 0440
yes it can take awhile for the SES light to go out after you've replaced the gas cap (asuming that was the problem). You could go to an Autozone or AdvanceAuto store; they usually will let you borrow their code reader (or use it themselves) to read and clear the codes right there in the parking lot....that will turn the light off immediately, and you can wait and see if it comes back on...
hope this helps
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