Scania fault code 40991
Code 40991 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:
CCU
LIN communication, fault in the air quality sensor.
The control unit has interpreted that there is a LIN communication error with the air quality sensor.
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ACC Automatic Climate Control
LIN communication
Fault in LIN communication with the air quality sensor T195.
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