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

• Volvo FH / FM / FMX / VNL / VNR
• Mack MP7 / MP8 engines
• Volvo D11 / D13 / D16 engines
• Mack CHU / CXU / GU / Pinnacle series
• EPA10 / Euro 5 / Euro 6 SCR emission systems

OEM / Cross reference numbers:

• 22303390
• 21479638
• 21567764
• 21636091 / 21346959 / 21302275 / 21227721 (family cross references)
• 5WK97367 / 5WK9 7367 (Continental platform)

👉 This sensor is typically used as an inlet (upstream) NOx sensor in SCR systems.

FUNCTION:

• Measures nitrogen oxide (NOx) levels in exhaust gas before SCR catalyst
• Sends real-time data to ECU via CAN (J1939 communication)
• Helps control AdBlue dosing for optimal SCR efficiency
• Monitors engine emissions performance
• Prevents engine derate and SCR system faults

INSTALLATION POSITION:

• Inlet (upstream) NOx sensor
• Mounted before SCR catalyst on exhaust system
• Usually paired with a downstream NOx sensor for full system monitoring

IMPORTANT NOTE:
Volvo/Mack NOx sensors like 22303390 belong to a shared SCR sensor family, meaning:

• Same sensor platform used across multiple OEM numbers
• Inlet and outlet sensors are NOT interchangeable
• Harness length and calibration vary depending on engine configuration
• ECU software defines correct operation

Incorrect installation can trigger SCR faults, AdBlue errors, or limp mode.

FAQ:

Q1: Is this inlet or outlet sensor?
A1: 22303390 / 21479638 / 21567764 is commonly used as an inlet (upstream) NOx sensor.

Q2: What vehicles does it fit?
A2: Volvo FH/FM trucks, Mack MP7/MP8 engines, D11/D13/D16 engines.

Q3: Are all part numbers interchangeable?
A3: Yes, these numbers belong to the same Volvo/Mack 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.