Fitment
Compatible with Volvo heavy-duty diesel trucks equipped with SCR (Selective Catalytic Reduction) emission systems requiring NOx monitoring. Commonly used in SNS 24V exhaust aftertreatment systems. OEM part number 21244501 and cross reference 5WK9 6664 should be verified before installation.

FAQ
Q1: What does this NOx sensor measure?
A: It measures nitrogen oxides (NOx) in exhaust gases for SCR emission system feedback control.

Q2: Which trucks is it compatible with?
A: It is used in selected Volvo diesel trucks depending on engine configuration and emission system type.

Q3: Is this a universal part?
A: No, compatibility depends strictly on OEM part number 21244501 or equivalent reference 5WK9 6664.

Q4: Does installation require programming?
A: Some vehicles may require ECU reset or diagnostic adaptation after replacement.

Q5: Where is it installed?
A: It is installed in the exhaust aftertreatment system, typically upstream or downstream of the SCR catalyst.