Fault codes I have on my bmw x5 2003 is p3505 p1260 p09f6 what do I need to fix them

code p 1260 refers to vehicle immobil;izer invalid ignition key/immobilizer system fault
try using the scan tool to reset the ECM or talk with a dealer service center for the immobilizer problem
make sure that the battery in the key fob is fully charged if it just happened

have code read most auto stores offer this service for free the code will assist you on how to repair or service vehicle the computer is advising something is wrong you will need to fix it first --you can reset the computer everyday but if fix is not done it will come back each time

You will need a scan tool that works on that BMW to clear any warning lights such as a check engine light. Unless you have resolved the problem/ fault that has caused the warning light you are wasting your time clearing it as an unresolved fault that has not been fixed will, once you drive the car again, generate the check engine light again together with a bunch of fault codes that can be read by the scan tool.

fix the fault shown and then use a scan tool to reset the ECM
if you don't fix the problem it will be back with in minutes

Hey Mark see info below

It's gone into "limp home mode"

code p1105 refers to manifold absolute pressure(MAP) sensor, TC system-leak detected. causes ---intake leak, ---hoses There are to references to p1105 The second response is still map sensor but the causes are---TC system--mechanical fault--air leak between throttle body-TC,map sensor---TC system--exhaust blockage
code p1260 refers to throttle return spring--weak spring force. causes ---mechanical fault,--,throttle control unit
code p1264 refers to throttle valve opening-accelerator released causes ---throttle control unit---mechanical fault

from what research I have found it looks like the glow plugs is the answer to the question of what code # P3505 is.
I hope I helped you in the right direction, it would make sense why it wont start.

Either do a search in bimmerfest.com or a Google search on BMW fault codes.

What? that's crazy! why wont you take advises from several mechanics? this is the best solution.