[Stickler]

Hi to all,

in all desperation, I'm asking for your advice here, maybe someone can help..
In September, I visited local (Czech) good car garage with my E92 335xi (2008) for a xDrive distribution box overhaul. It was still original without a previous overhaul when driving around 230 tkm, and therefore it was already twitching a little. Otherwise, it worked 100%.
After about 4 hours, I got the car with a NON-WORKING xDrive. The motor refused to move for calibration. Service owner evaluated the situation from his experience as a defective actuator and, after an agreement, found and sent me a new OEM one.
Together with other things, I took the car to the another BMW service center for, among other things, the replacement of the xDrive actuator. But without change. In doing so, they discovered that either by accident or someone's fault, is K.O. control unit for xDrive. So I got a another one (used), functional, 1:1. The (almost) new control unit communicates and has been coded. But without change. So they tried to another actuator. Unchanged. There were a total of 3 of the other actuators they tried, so a total of 5 actuators were non-functional - which is nonsense. None of them respond when trying to calibrate, and the diagnostic throws an error that the operation cannot be performed. They checked the entire wiring, remeasured it. Everything is alright.
Tried original BMW diagnostics, tried Delphi, tried Hella, nothing. They tried different settings, nothing. BMW employee's attitude: Defective actuator (nonsense). Consulted with another specialist who do xDrive distribution box overhauls, he doesn't know either.
In a few rare cases, it happened that the actuator did not communicate and after its replacement everything was OK. Not in my case. No one can help..
xDrive non-functional, as well as ABS, DTC.. The car is actually unusable for normal driving and we have been solving the problem unsuccessfully for a month. We also tried various xDelete app modes, disconnecting/connecting the car battery and other obvious things, but NO CHANGE.

Since there may be a hypothetical suspicion of another reason that is not directly related to the xDrive (that is, for example, another control unit prevents the passage of the signal towards the actuator - even though everything was fully functional until the overhaul), I am sending below a complete list of the functional modifications of the car over the years, in case someone knew it could be that..

BMW E92 335i xDrive 2008 (ZF a/t)

• FBO modification (7" VRSF Competetion intercooler, VRSF downpipes, VRSF aluminum chargepipe with BOV Tial, Fuel It! Stage 3 LPFP, DCI intake MTC motorsport with silicone inlets, Supersprint exhaust, Aluminum PCV valve, MHD Stage 2+, xHP Stage 3, commonly used xDelete for 80/20 ratio (now ON) and other mods like 380mm BBK Brembo, new chassis, etc.)
• ID4 Motion digital clusters + blind spot detecting
• Replaced CCC Professional system with CIC Professional + 12.3" Android system
• Replaced air conditioning panel with LCI
• Replaced gear selector head with LED M3 (tried to disconnect - no change = should not affect non-functionality)
• Added e. rear window blind + new center panel buttons
• Disconnected (more precisely permanently connected) brake pad wear monitoring due to incompatibility with BBK Brembo
• Along with the complete modification of the car to the OEM M3 look, new M3 mirrors in TOP specification were also added
• Audio expansion with tweeters in Hifi specification + new OEM BMW B&O Individual Kevlar mid-bass
• Interior rear-view mirror with FLA camera (FLA function not connected yet)
• Today, LCI paddles under the steering wheel (despite of modifications it not working - I will replace them with other ones)
• LCI start button
• ... otherwise, apart from gradually replacing non-functional parts with new ones over the years (such as levers under the steering wheel) and programming various common functions, I can't think of anything electrical...

Thanks in advance for any advice you might have!