BMW E60 N53 injector fault and replacement
How does an N53 injector fault show up?
Leaking injectors make the car jerk and run roughly at idle, especially when cold and after standing for a long time. Replacing the injectors, coils and spark plugs made the car run smoothly.
Do all the N53 injectors have to be replaced at once?
If there are symptoms, it is worth replacing all the injectors at once, because replacing them one at a time is awkward. What matters is the injector's index number (e.g. -08 or -11), not the part number. On the N53 mixing indexes is allowed, unlike on the N54.
What has to be done after replacing the injectors?
The new injector's number code is recorded and the injector values are coded to the engine control unit. After that the adaptations are reset and the flywheel adaptation is carried out. Without it the warning light came on and the engine ran with a stutter, and the adaptation drive could not be done.