Fitment
Compatible with Volvo heavy-duty diesel emission systems (SCR / Euro VI platforms)

Vehicle applications include:
Volvo VN
Volvo VNL
Volvo VHD
Volvo FH
Volvo FM
Volvo Trucks D13 diesel engine systems

FAQ

Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide levels in diesel exhaust and sends real-time data to the SCR system to control DEF (AdBlue) dosing and reduce emissions.

Q2: Where is this sensor installed?
A2: It is installed in the exhaust aftertreatment system, usually as inlet or outlet NOx sensor depending on SCR configuration.

Q3: Are 21636091 and 5WK96644E the same?
A3: Yes, they are cross-reference OEM and aftermarket identifiers for the same NOx sensor family.

Q4: Is this used in Volvo D13 engines?
A4: Yes, it is commonly used in Volvo D13-powered VN, VNL, and VHD trucks.

Q5: What are common failure symptoms?
A5: Engine warning light, SCR/DEF system faults, NOx sensor signal errors, or engine derate mode.