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Shutoff valve? S80 1999

(1999 S80 T6) I've been driving around for quite some time now with the check engine light on and the Vadis system says the shutoff valve is defective.

What does the shutoff valve do? Does it matter if I drive the car around with this kind of error flagged?

I also wonder if my gas mileage is affected because maybe the computer runs in limp mode.

Thanks!

Alex






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