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

• Caterpillar industrial diesel engines
• CAT construction machinery (excavators, loaders, generators, etc.)
• Off-highway equipment with Euro 5 / Euro 6 or EPA SCR emission systems
  Using reference numbers:
• 441-5130-03 / 441513003
• 5WK97357
• A2C92692400-02
• SCR NOx sensor system equivalent variants depending on calibration

Used in exhaust aftertreatment systems to monitor NOx levels and control AdBlue/DEF injection for emissions compliance.

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 regulate AdBlue dosing and reduce emissions.

Q2: Where is it installed?
A2: It is installed in the SCR exhaust aftertreatment system, typically before or after the catalytic converter depending on machine configuration.

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

Q4: Is 441-5130-03 the same as 5WK97357?
A4: Yes, 441-5130-03 is the Caterpillar OEM part number and 5WK97357 / A2C92692400-02 are supplier cross-references for the same NOx sensor unit.