FITMENT:
Compatible with Volvo heavy-duty trucks equipped with SCR (AdBlue/DEF) systems, including:

• Volvo FH series (FH12 / FH13 / FH16 / FH500 / FH540)
• Volvo FM series (FM9 / FM11 / FM13 / FM500)
• Volvo FMX / FE / FL (depending on SCR configuration)

OEM / Cross reference numbers:

• 21984358
• 5WK96717A / 5WK9 6717A
• 22219283 / 20873395 / 22315990 (common interchange family)

This NOx sensor is used in Volvo Euro 5 / Euro 6 SCR systems to monitor nitrogen oxide levels in exhaust gas and control AdBlue dosing for emissions compliance.

FUNCTION:

• Measures NOx concentration in exhaust stream
• Sends data to ECU via CAN communication
• Controls SCR/AdBlue injection strategy
• Ensures Euro 5 / Euro 6 emissions compliance and SCR efficiency

INSTALLATION POSITION:

• SCR system inlet or outlet sensor (depends on truck configuration)
• Mounted between DPF and SCR catalyst or after SCR system

IMPORTANT NOTE:
This sensor belongs to a Volvo SCR NOx sensor family where multiple part numbers (21984358 / 22219283 / 22827993 etc.) may look similar but differ in:

• Harness length
• Connector shape
• Calibration/software version

Always confirm OEM number or VIN before ordering.

FAQ:

Q1: Is this inlet or outlet sensor?
A1: 21984358 / 5WK96717A is commonly used as a post-SCR (outlet) NOx sensor in Volvo FH/FM systems, but position may vary by ECU setup.

Q2: What vehicles does it fit?
A2: Volvo FH and FM Euro 5/6 trucks, especially FH500/FM500 D13/D16 SCR-equipped models.

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

Q4: Are all 5WK96717A sensors interchangeable?
A4: They are in the same family but must match exact calibration and OEM part number.

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