[T77911S]

its my sons car. he bought it with some problems.
it had a bunch of codes and would only run in limp mode.
not sure of year but it is the N55 engine.
with as many codes that it had i was hoping something was loading the DME down.

we did fix some of the codes.
it was the valve tronic motor for the cam lift timing.

the codes come up as soon as your turn the car to "on".
the codes left are
charge pressure sensor intake electrical short to earth
absolute pressure sensor electrical short to earth
rail pressure sensor electrical short to earth

not sure what this one is but i dont think it matters.
AUC sensor internal sensor fault. i think it has something to do with heat/ac

what we have done:
he has replaced all the sensors that have codes with BWM sensors.
we checked the wiring. nothing is shorted.
he sent the DME off to be tested/repaired and it was good.
battery is new, it is also on a charger
he also replaced that (dont remember what its called) electrical "box" that is connected directly to the battery.
and yes we can clear all the codes.

here is the thing.
if you unplug the sensors you get the SAME "electrical short to earth " fault.
so we think for some reason the DME is not "seeing" the sensors.

i have been thinking about voltage. as in the reference voltage that some sensors use. maybe its wrong or missing.
not sure why though as that "should" come from the DME and that tested good.
is there anything common between these sensors???