2010 BMW M3 Coupe (E92) V8-4.0L (S65) Page 58
Engine Controls - Driveability/DTC 2AF9 Stored
SI B12 07 12
Engine Electrical Systems
April 2012
Technical Service
SUBJECT
S65: Engine Coolant Temperature Sensor Is Faulty
MODEL
E90, E92, E93 M3 with the S65 engine
SITUATION
The engine could enter the emergency program or experience performance and rough idle complaints.
The following fault may also be stored: 2AF9: Coolant temperature sensor
CAUSE
This could be caused by an internal fault of the coolant temperature sensor or a sporadic connection problem with the temperature sensor connector,
due to vibration-induced movement.
CORRECTION
Replace the coolant temperature sensor, and install a coolant temperature sensor harness repair kit.
Follow the ISTA D Repair Instruction: 12 51 xxx - Exchanging plug-in contact of coolant temperature sensor (S65).
Note:
When the ISTA system message displays: Battery voltage only "XX.XX" V. Please connect charger. Please note the displayed battery voltage
reading in the repair order comments section.
PARTS INFORMATION
2010 BMW M3 Coupe (E92) V8-4.0L (S65) Page 59
