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19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4739 PID: SPN: 1761 FMI: 11 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor- Root Cause Not Known

Circuit DescriptionThe aftertreatment diesel exhaust fluid tank level sensor is used to monitor the aftertreatment diesel exhaust fluid level inside...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4745 PID: SPN: 3515 FMI: 11 Aftertreatment 1 Diesel Exhaust Fluid Temperature 2- Root Cause Not Known

Circuit DescriptionThe DEF quality sensor is a smart device and communicates with the engine electronic control module (ECM) via the...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4747 PID: SPN: 3217 FMI: 20 Aftertreatment Intake Oxygen Sensor- Data Not Rational- Drifted High

Circuit DescriptionThe aftertreatment intake NOx (nitrogen oxides) sensor is a smart device and communicates with the engine control module (ECM)...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4748 PID: SPN: 3217 FMI: 21 Aftertreatment Intake Oxygen Sensor- Data Not Rational- Drifted Low

Circuit DescriptionThe aftertreatment intake NOx (nitrogen oxides) sensor is a smart device and communicates with the engine control module (ECM)...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4749 PID: SPN: 3227 FMI: 20 Aftertreatment Outlet Oxygen- Data Not Rational- Drifted High

Circuit DescriptionThe aftertreatment outlet NOx (nitrogen oxides) sensor is a smart device and communicates with the engine control module (ECM)...

19 August, 2025

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4751 PID: SPN: 3227 FMI: 21 Aftertreatment Outlet Oxygen- Data Not Rational- Drifted Low

Circuit DescriptionThe aftertreatment outlet NOx (nitrogen oxides) sensor is a smart device and communicates with the engine control module (ECM)...

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