I've been having an ongoing issue with my 2008 E61 535xi. It drives fine 99% of the time, except in certain situations where i floor it with a heavy load (ie from a slow speed or uphill). It will then throw a code for 2ABC boost sensor short circuit to positive and go into limp mode. Apart from the lack of boost, the engine still runs well in limp mode. This does not occur any other time, or when I floor it under a lighter load (ie from 100 km/h to 150 km/h). Some vehicle history: I bought it with an unknown history in 2018 or so. The turbos don't rattle and feel strong - they must have been replaced prior to my purchase. Since then I've put a lot of work into the car. Focusing on the engine, off the top of my head, it's got new index 12 injectors, boost sensors (both), a new cable from the boost sensor to the ECU. VRSF 7.5" intercooler. Reasonably recent plugs and coils. silicone vacuum lines. Just refreshed the VANOS solenoids too. Stage 1+ MHD, ACN91. Log attached. I let off the throttle at 11.24 seconds. It goes into limp mode when I let off the throttle, but it always pulls well up until that point. From the error details, limp mode can be pinpointed to the time where rpm is 5024 and the throttle valve is 1.87°TPS. Seems to be right when I let off the throttle, possibly during an upshift. I feel like I've ruled out everything but the tune, but I'm open to any advice, opinions, or things to try. Or maybe you know a better forum to ask. I'm out of ideas.