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yes N20.. im aware of chain issues.. so far no problem... i was over powering my car in uphill -cruise control in 90+km ..
i guess the winning sound was imagination after the error code might be...
today I ve checked no such sound.

there is no fault code display in idrive but
... then run diagnostic obd2 Carista v6.5.1 Android app

i got this...

Junction box (passenger) (JBBF):
8020E9
8020D9

Engine:
120308 - Charge-air pressure control, lower value: charge-air pressure too low

Traction/stability control:
4809AB - DSC: undervoltage in vehicle

Center roof module:
801A4C
801A4A - Anti-theft alarm system: tilt sensor and interior movement detector deactivated

Infotainment system:
E1C440 - HU-H: reset

Central module (in driver's footwell) (FRM):
800F92 - Welcome light, repeat interlock, active

please explain is it major issues ...