Fitment

Fits for:

• Caterpillar Tier 4 Final off-highway equipment
• Engines: Cat C7.1 / C9.3 / C13 / C15 / C18 diesel engines
• Machines: wheel loaders, excavators, dozers, motor graders, industrial generators
• Systems: SCR (Selective Catalytic Reduction) emissions aftertreatment
• Position: Exhaust NOx sensor (engine-out / upstream SCR depending on configuration)
• OE / Cross References: 441-5127-01 / 441-5127-03 / 5WK97354 / SNS354 / A2C10474600-01 / 4415127 / Cat NOx sensor group family

FAQ

Q1: Are 441-5127-01 and 5WK97354 the same sensor?
A1: Yes. 441-5127-01 is the Caterpillar OE number, and 5WK97354 is the sensor manufacturer reference used for the same NOx sensor assembly in SCR systems.

Q2: What equipment uses this sensor?
A2: It is commonly used on Caterpillar Tier 4 Final engines such as C7.1, C9.3, C13, C15, and C18 in off-highway machines including excavators, loaders, graders, and generators.

Q3: Is this inlet or outlet sensor?
A3: It can be used as engine-out (upstream) or SCR-related NOx sensor depending on system configuration. Cat SCR systems often use multiple identical NOx sensors in different positions.

Q4: What does this sensor do?
A4: It measures nitrogen oxide (NOx) levels in exhaust gases and sends real-time data to the ECU over J1939 communication to control SCR/DEF dosing and reduce emissions.