brings up fault code p1557. (charge pressure control positive deviation) i have checked all vacuum lines, tried blocking egr valve to no avial, also have stripped and cleaned turbo vanes! and tried a known good air flow meter still no difference also replaced n75 valve! still lacks power! have full vacuum on turbo actuator constantly therefore i get this over boost code?
should there be full vacuum on turbo actuator even at idle?
i can clear this code but comes straight back.
help please!
should there be full vacuum on turbo actuator even at idle?
i can clear this code but comes straight back.
help please!