Engine Controls - MIL ON/DTCs 29E0, 29E1,118001,118101
SI B 12 05 10
Engine Electrical Systems
March 2010
Technical Service
SUBJECT
Various DME Faults: Mixture Too Lean
MODEL
E70 (X5 M) with S63 engine
E71 (X6 or X6 M) with N63 or S63 engine
E72 (ActiveHybrid X6) with N63 engine
F01 and F02 (7 Series) with N63 engine
F07 (5 Series) Gran Turismo with N63 Engine
SITUATION
The Service Engine Soon lamp is illuminated while driving. The following faults are stored in the DME memory:
E70, E71, and E72
29E0 Fuel mixture control, mixture too lean, bank 1
29E1 Fuel mixture control, mixture too lean, bank 2
F01, F02, and F07:
2010 BMW 750i xDrive AWD (F01) V8-4.4L Turbo (N63) Page 257
118001 Fuel mixture control, mixture too lean, bank 1
118101 Fuel mixture control, mixture too lean, bank 2
CAUSE
Unmetered air leak in the induction system or a miscalculation of the air usage in the induction system
PROCEDURE
Perform all applicable test plans for the faults stored; a mechanical leakage, restriction, or electrical failure of an induction system component should
not be overlooked. If the results of the test plans are inconclusive, proceed to the troubleshooting hints provided below.
Smoke testing the induction system is the most effective way to determine the positive integrity of the system. For more information regarding the
approved tools, refer to SI B11 04 07. Refer to the illustrations below for some key areas to inspect during the smoke testing process.
Inspect the Charge Air Line (1) connections and the clamps (part removed for clarity).
Check the tightness of the attachment screw (2).
Check the crankcase ventilation system connection (3).
Check the connection at the flexible coupler (4) on the air box.
Remove the filtered air duct (5) for inspection.
With the filtered air duct removed, inspect the sealing surfaces (1).
Carefully inspect the sealing surfaces (inside and outside) of the gasket.
