Join Date: Apr 2011
Location: Alexandria Va
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A P0455 can be caused by no less than a dozen parts or a leak in a small supply hose. The operating pressure used to detect this fault is no more than 1 psi, this is not something the average diy'er can successfully diagnose without blindly guessing.
That might be one reason to take it to the dealer to get checked out. An hour of diagnostic labor to get an answer might be worth it.
05 6 I Sport VE L3 ATX, Koni Sport/OE springs, LED conversion, AuxMod, VAD bypass.
"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur" Red Adair