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Hello my names Marc, ill assist you with this problem, let me take a look at the notes above
is the fault happening all the time, and do you have a way to disable the traction control on your vehicle via a button
should be a DTC button somewhere on the dash, press and hold this for 8 - 10 seconds, the light will stay on permamnantly this indicates the traction control is now disabled, do not drive the car yet. let me know when you have got to this stage.
take the car for a spin, be very caerfeul as the traction control is now disabled, the yellow light should remain on the dashboard permamnently. if the fault dissapears then i think i may know what it is. let me know after a road test and be very careful round corners
ok, this can rule out a problem on the traction control system that can limit the performance and make it judder, so we rule that outmy next advice would be to check the mass air flow sensor have you done this already?
the voltage to what is 0 ?
ok, this could indicate a fault in the wiring , and would explain the symptoms, the mass air flow helps control the fuel air mix, and if unplugged should resort to stored values to run smooth. with a reading of 0v this would indicate a break in the wire somewhere and being totaly unresponsive, my advice would be to check all the wiring for the mass air flow sensor, and replace the sensor aswell
im unable to assist any further im not certain about the valvetronic issue, would you like me to leave this for another expert.
Thank you for using JA. I'm Baz, one of the automotive experts, I try to be available in the afternoon on weekdays and in the evenings on the weekend. I apologise if I do not respond to your question promptly, I can assure you that I will respond as soon as I can. Thank you
What type of fault code reader did you use? Generic obd2 readers don't pick up faults on BMW cars.
Do you have power+ground at the MAF connector?
If you're doing the work yourself, I would recommend opening it and dry it out and clean the pcb+components with an electrical contact cleaner and see what happens after. Leave it on a radiator for a few days because water can get under the black chips on the pcb even if it all looks dry, use compressed air if you have access to it.
There are online services that repair ECU modules (which is the best option), because if you replace the ECU, you may have to replace other components such as the BCM/igntion module+keys etc.