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

• Caterpillar industrial diesel engines
• CAT construction machinery (excavators, loaders, generators, etc.)
• Off-highway equipment with SCR Euro 5 / Euro 6 or EPA emissions systems
• Select CAT aftertreatment SCR configurations depending on engine calibration

Using reference numbers:

• 359-9172-02 (Caterpillar OEM part number)
• 5WK96726 (Continental/VDO sensor cross-reference)
• SCR NOx emission control system sensor variant

This sensor is part of the exhaust aftertreatment system, used to measure nitrogen oxide (NOx) levels and regulate AdBlue/DEF injection.

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

Q2: Where is it installed?
A2: It is installed in the SCR exhaust system, typically upstream or downstream of the catalytic converter depending on machine setup.

Q3: What are symptoms of failure?
A3: Check engine light, SCR/DEF warnings, NOx sensor fault codes, reduced engine power, or engine derating.

Q4: Is 359-9172-02 the same as 5WK96726?
A4: Yes, 359-9172-02 is the Caterpillar OEM number and 5WK96726 is the supplier cross-reference for the same NOx sensor unit.