FITMENT:
Compatible with Volvo Euro 6 heavy-duty trucks, including:

• Volvo FH series (FH13 / FH16 / FH500 / FH540 / FH750)
• Volvo FM series (FM9 / FM11 / FM13 / FMX / FM500)
• Some Renault T-series trucks using shared SCR architecture

OEM / Cross reference numbers:

• 5WK97373 / 5WK9 7373
• 21558128
• 22219276
• 22827993
• 22315986 / 22827992 (common related variants)

This NOx sensor is part of the Euro 6 SCR aftertreatment system, used to measure nitrogen oxide levels before or after the SCR catalyst depending on configuration.

FUNCTION:

• Measures NOx concentration in diesel exhaust gases
• Sends real-time data to ECU via CAN communication
• Controls AdBlue (DEF) injection for SCR system
• Ensures Euro 6 emissions compliance and catalyst efficiency

INSTALLATION POSITION:

• SCR system inlet (pre-cat) or outlet (post-cat), depending on vehicle configuration
• Mounted on exhaust pipe between DPF and SCR catalyst or after SCR unit

IMPORTANT NOTE:
This Volvo NOx sensor family uses multiple cross-reference numbers (21558128 / 22219276 / 22827993). They may look similar but differ in:

• Cable length
• Connector design
• Calibration software version
  Always match OEM number or VIN before ordering.

FAQ:

Q1: Is this inlet or outlet sensor?
A1: 5WK97373 can be used as either inlet or outlet NOx sensor depending on Volvo SCR system layout and ECU configuration.

Q2: What vehicles does it fit?
A2: Volvo FH and FM Euro 6 trucks (D13/D16 engines) and some Renault trucks with shared SCR systems.

Q3: What are failure symptoms?
A3: SCR warning light, engine derate, AdBlue system faults, incorrect NOx readings, or limp mode.

Q4: Are all listed part numbers interchangeable?
A4: They are part of the same sensor family but must be matched carefully due to calibration differences.

Q5: Does it require programming after installation?
A5: Some Volvo trucks require SCR reset or ECU adaptation after replacement.