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Well, I bought this 2006 330xi (82,xxx) back in December and it's already giving me problems.
Right after I purchased the car, it threw a P1553 code according to a generic OBD-II scanner. I took it to the place I bought it and they swapped two sensors around and changed the oil. The code returned, so I took it back and they replaced the sensor. I thought the guy told me it was one of the cam sensors, but I honestly don't remember.
The code has not returned.
Anyway, my issue now is that when the car is warmed up, it seems to hunt for the correct idle when in Drive or Reverse. Shifting into Neutral or Park and the issue goes away.
Hopefully this video helps. You can also feel the drop in idle as the car shakes. Thank you very much!