Fitment

Fits for:

• Caterpillar heavy machinery (various models)
• CAT Excavators, Loaders, Dozers, Generators
• Engine / Equipment: CAT C4.4, C7.1, C9.3, C13, C15, C18, C175 series (depending on application)
• Position: Exhaust aftertreatment NOx sensor (SCR inlet or outlet depending on system design)
• OE / Cross References: 359-9172-02 / 3599172 / 5WK96726 / 5WK96726A / 5WK96725A / SNS726 / 441-5127 / 441-5128 / Caterpillar NOx sensor family

FAQ

Q1: Are 359-9172-02 and 5WK96726 the same sensor?
A1: Yes. 359-9172-02 is the Caterpillar OE part number, and 5WK96726 is the Continental NOx sensor reference used in CAT SCR/emissions systems.

Q2: What machines use this sensor?
A2: It is used on multiple CAT machines including excavators, generators, loaders, dozers, and engines such as C4.4 and C9.3 platforms.

Q3: What does this sensor do?
A3: It measures nitrogen oxide (NOx) levels in exhaust gases and sends signals to the ECU to control SCR/DEF dosing and reduce emissions.

Q4: Is it inlet or outlet sensor?
A4: It can be configured as either upstream or downstream NOx sensor depending on aftertreatment system layout.