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P0455 has several pages of potential causes. It's typically a loose gas cap (95% of the time). Otherwise can be vaccum leaks, fuel leaks, etc. It's usually a very minute problem that will not damage your car, but will, if there is a legitimate leak, lower gas mileage and/or performance.

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Q: Code on your Nissan maxima 02 of p0455 which is a large emission leak what should you do or replace myself without going to dealer or mechanic?
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