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ATI provides professional technicians with a regular diet of repair information on BMW, Mercedes-Benz, Nissan, Volkswagen, Audi, Porsche and more. Search by keyword (site-wide or on marque-specific sites), by vehicle marque or publish date. Access is FREE.

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When is a vacuum leak not a vacuum leak?

When it’s hiding in the EVAP system of a Porsche Cayenne.

A P0455 code points to an EVAP problem, but the EVAP system checks out OK with our smoke tester. And the purge valve checks out as well. So where could the problem lie?

Our derFix Super Sleuths unravel the mystery.

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