Tunerbuilder

I replaced the right inner and left outer front parktronic sensors on my '05 545i SMG today, and did so without removing the front bumper in only about 20 minutes.. It's alot easier than people make it out to be. To get at the front outer sensors, turn the front wheels either left or right so you can access the fender liner bolts. Remove the two 8mm and one 10mm bolts that hold the front fender liner to the front bumper cover. Then pry the edge of the fender liner out from the bumper (picture 4) and flex it open so you can see into the area behind corner of the bumper cover (picture 3). The front inner sensors: Remove the grill inserts (picture 1), then you can easily access the front inner sensors (picture 2).

No bumper removal required, easy peezy.