FITMENT:
Compatible with Volvo and Mack heavy-duty trucks equipped with SCR (AdBlue/DEF) Euro 5 / Euro 6 systems, including:

• Volvo FH / FM / FMX / VNL / VNR
• Mack MP7 / MP8 engines
• Volvo D11 / D13 / D16 engines
• EPA10 / Euro 5 / Euro 6 SCR systems

OEM / Cross reference numbers:

• 21346963
• 22014032
• 21479637 / 21567763 / 21636088
• 5WK96643E / 5WK9 6643E
• 22303391 (related outlet sensor family)

This NOx sensor is typically used as a downstream (outlet) SCR sensor, monitoring nitrogen oxide levels after the catalyst for emissions control and system efficiency.

FUNCTION:

• Measures NOx concentration in exhaust gases after SCR catalyst
• Sends real-time data to ECU via CAN (J1939) communication
• Monitors SCR catalyst efficiency and AdBlue dosing performance
• Helps ensure Euro 5 / Euro 6 compliance and prevent engine derate

INSTALLATION POSITION:

• Outlet (downstream) NOx sensor in SCR system
• Mounted after SCR catalyst on exhaust line

IMPORTANT NOTE:
This Volvo/Mack NOx sensor belongs to a shared Gen 3 SCR sensor family, meaning:

• Multiple OEM numbers refer to same sensor platform
• Outlet and inlet sensors are NOT interchangeable
• Wiring length and calibration may differ by engine/application

Always confirm OEM number or VIN before ordering.

FAQ:

Q1: Is this inlet or outlet sensor?
A1: 21346963 / 22014032 / 5WK96643E is commonly used as a downstream (outlet) SCR NOx sensor.

Q2: What vehicles does it fit?
A2: Volvo FH/FM trucks, Mack MP8, and Volvo D11/D13/D16 engines.

Q3: What are failure symptoms?
A3: SCR warning light, engine derate, NOx sensor faults, AdBlue system errors, limp mode.

Q4: Are all listed part numbers interchangeable?
A4: Yes, they belong to the same Volvo/Mack NOx sensor family platform.

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