Scania fault code 5504
Code 5504 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMD
NOx sensor upstream of catalytic converter
Invalid signal from the NOx sensor.
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EME
NOx sensor upstream of catalytic converter
Invalid signal from the NOx sensor.
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EMO
NOx sensor upstream of catalytic converter
Invalid signal from the NOx sensor.
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