Not P1054, but I repaired mine as well, and if I recall correctly, I just carefully pried the case open, using a sharp blade and patience. I did the re-solder per this thread: https://www.rs6.com/showthread.php/3...ir-with-photos and it's been working fine ever since. I also did it with the sensors still attached to the car because they are pretty much impossible to remove with the engine installed.