Sorry you have had such bad luck. If I got that code I doubt I would have thought much of it. I would have cleared it and hoped it did not come back. Search around and read about what happens when people accidental put gasoline in the tank. Perhaps that will give you some ideas for a more affordable repair. I assume you got zero warranty from dealer. Have you contacted them? Sometimes they surprise you.

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2009 35d, 2006 325i & 330i