FITMENT
Compatible with Volvo heavy-duty diesel trucks equipped with SCR (Selective Catalytic Reduction) AdBlue emission systems requiring NOx monitoring.
Common applications include:

• Volvo FH series trucks
• Volvo FM series trucks
• Volvo FMX construction trucks
• Euro 5 / Euro 6 SCR diesel engine platforms (depending on calibration)
  Using reference numbers:
• 21040930 (Volvo OEM part number)
• 5WK96665 (Continental/Bosch sensor family cross-reference)

Used in SCR exhaust aftertreatment systems to measure NOx levels and control AdBlue dosing for emissions compliance.

FAQ
Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide (NOx) levels in the exhaust system and sends real-time data to the ECU to regulate AdBlue/DEF injection and reduce emissions.

Q2: Where is it installed?
A2: It is installed in the SCR exhaust system, typically before or after the catalytic converter depending on system design.

Q3: What are symptoms of failure?
A3: Check engine light, SCR/DEF warnings, NOx sensor fault codes, reduced engine power, or limp mode activation.

Q4: Is 21040930 the same as 5WK96665?
A4: Yes, 21040930 is the Volvo OEM number and 5WK96665 is the supplier cross-reference for the same NOx sensor unit.