This turbo vain code has been coming and going but here of late service messages for FWD, Stability and Trailer brake have been popping on while driving with a lunging like it braking or shifting. Brought it to a dealership and they told me that is due to the turbo codes. Is this a viable reason for the these service messages to pop up? They recommended replacing the turbo but I don't want to spend the money if it will not correct these other issues. Please advise