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p2406 Volvo s80 2003, what does this mean?

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My check engine light is on and the code reads p2406?

Vehicle: Volvo s80 2003 not a turbo

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P2406 Leak diagnostic unit

The leak diagnostic unit is for the EVAP system,it measure pressure in the fuel tank system,Because the code is signal high this comes from poor termianal contact to a defective leak diagnostic unit

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