FITMENT
Compatible with Caterpillar diesel engines equipped with SCR (Selective Catalytic Reduction) AdBlue/DEF emission systems requiring NOx monitoring.
Common applications include:

• Caterpillar heavy-duty industrial engines
• Caterpillar off-highway machinery (excavators, loaders, generators, etc.)
• EPA / Euro emission-controlled CAT diesel systems using SCR aftertreatment

Using reference numbers:

• 441-5127-01 / 441512701
• 5WK97354 (sensor manufacturer cross-reference – Continental/Bosch family)

Used in SCR exhaust aftertreatment systems for emissions compliance and NOx control.

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

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

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

Q4: Is 5WK97354 the same as 441-5127-01?
A4: Yes, 441-5127-01 is the Caterpillar OEM part number and 5WK97354 is the sensor supplier reference for the same SCR NOx sensor unit.