One of my friends has a 2009 a4 convertible. Intermittently the car will have a hard time to start and pull a bunch of random codes. The codes are p2401 p2295 p0458 and p0245. When i look at it there is no cel on. Seems to run ok, it kinda feels like there is no power. The turbo apparently was replaced last year. I was thinking it is an electrical issue seeing how the codes arent really related to each other. Any help would be great.
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