FITMENT
Compatible with heavy-duty diesel engines equipped with SCR (Selective Catalytic Reduction) AdBlue emission systems requiring NOx monitoring.
Common applications include:

• Cummins ISB / ISX / X-series diesel engines
• DAF / truck SCR systems (various platforms depending on calibration)
• EPA10 / Euro emission SCR aftertreatment systems

Using reference / cross numbers:

• P1954664PRX
• 4326872 / 4326872RX
• A045S169
• 5WK96749B (cross reference in aftermarket listings)

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

Q2: Where is it installed?
A2: It is installed in the exhaust aftertreatment system, typically before or after the SCR catalyst depending on vehicle layout.

Q3: What are symptoms of failure?
A3: Check engine light, SCR/AdBlue system faults, NOx sensor error codes, reduced engine performance, or engine derating/limp mode.

Q4: Are all listed part numbers interchangeable?
A4: They are cross-referenced OEM and aftermarket equivalents, but correct fitment depends on engine model, emission standard (EPA10/Euro), and SCR configuration.