U059F
UNetworkInvalid Data Received From NOx Sensor B
What does this code mean?
Severity : MediumU059F means the control module is receiving invalid data from NOx sensor B. This smart sensor measures nitrogen oxides in the exhaust and sends its readings over the CAN network. The message arrives, but its content is implausible or out of range, which disrupts SCR system monitoring.
Symptoms
- Check engine light on.
- Possible AdBlue/DEF or emissions warning message.
- Disturbed reductant dosing.
- Eventual power limitation on some vehicles.
Possible causes
- Failed NOx sensor B.
- Corroded or loose sensor connector.
- Heat-damaged wiring.
- Faulty sensor power supply or ground.
- Control module software update needed, depending on the manufacturer.
Diagnosis and repair
- Inspect NOx sensor B connector and wiring.
- Check power and ground at the sensor control unit.
- Read the sensor values in live data and compare with sensor A.
- Check for a manufacturer software update, then replace the sensor if needed.
- Clear the code and road test.
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Code
U059F
Category
Network
Prefix
U
Standard
OBD-II / SAE J2012