Engine Controls/Cooling System - DTC 2D9B Knock Sensor Signal

SI M12 04 12
Engine Electrical Systems

February 2012
Technical Service

SUBJECT
N16 Service Engine Soon Lamp Illuminated: DME FC 2D9B Knock Sensor Signal

MODEL
All with the N16 engine produced from 8/1/2010

SITUATION
The Service Engine Soon lamp is illuminated with the following fault code stored in the DME memory:

2D9B: Knock sensor - signal

In addition to the 2D98 knock sensor fault, any of the following fault code entries may also be stored:

2F1A: coolant temperature sensor - signal

2F19: coolant temperature sensor - signal

2F15: coolant temperature sensor - plausibility

2F16: coolant temperature sensor - plausibility

2F22: engine temperature - plausibility

CAUSE
The knock sensor is not installed properly or the thermostat is faulty.

CORRECTION

A. Check that the knock sensor is positioned correctly, mounted with a torque of 20 Nm, and that the electrical connection is clean and secured. Refer to ISTA - REP 12 14 600.

B. If no problems are found with the knock sensor then replace the thermostat only.

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.





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