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

• Volvo FH / FM series trucks
• Renault Premium / T series trucks
• Renault & Volvo Euro 5 / Euro 6 SCR diesel systems
  Using reference numbers:
• 21473997 (Volvo OEM part number)
• 5WK96664D (Continental/Bosch sensor family cross-reference)

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

FAQ
Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide (NOx) levels in the exhaust and sends 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 vehicle configuration.

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

Q4: Is 21473997 the same as 5WK96664D?
A4: Yes, 21473997 is the Volvo OEM reference number and 5WK96664D is the manufacturer cross-reference for the same SCR NOx sensor unit.