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
• CHU / CXU / GU / Pinnacle series trucks
• EPA10 / Euro 5 / Euro 6 SCR aftertreatment systems

OEM / Cross reference numbers:

• 22303391
• 21567763
• 21069361
• 21636088 / 21479637 / 21346963 / 21302276 (family interchange references)
• 5WK97366 / 5WK9 7366 (Continental reference family)

FUNCTION:

• Measures NOx concentration in exhaust gas after SCR catalyst
• Sends real-time data to ECU via CAN (J1939 communication)
• Monitors SCR catalyst efficiency
• Controls AdBlue (DEF) dosing accuracy
• Ensures emissions compliance and prevents engine derate

INSTALLATION POSITION:

• Outlet (downstream) NOx sensor
• Installed after SCR catalyst in exhaust system

IMPORTANT NOTE:
This Volvo/Mack NOx sensor is part of a multi-cross-reference SCR sensor platform, meaning:

• Same sensor used across Volvo and Mack engines
• Multiple OEM numbers are interchangeable within SCR system
• However, inlet vs outlet sensors are NOT interchangeable
• Cable length and calibration may vary depending on vehicle configuration

Incorrect installation or wrong position may trigger SCR faults or limp mode.

FAQ:

Q1: Is this inlet or outlet sensor?
A1: 22303391 is commonly used as a downstream (outlet) SCR NOx sensor.

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

Q3: Are all part numbers interchangeable?
A3: Yes, 22303391, 21567763, 21069361 and related numbers belong to the same SCR sensor family.

Q4: What are failure symptoms?
A4: SCR warning light, engine derate, AdBlue system fault, NOx sensor error codes, limp mode.

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