Fitment
Compatible with Caterpillar diesel emission systems (engine-out NOx sensor group)

Equipment applications include:
Caterpillar Inc. C7.1 engines
Caterpillar Inc. C9.3 engines
Caterpillar Inc. 320D excavator
Caterpillar Inc. 330D excavator
Caterpillar Inc. 950H wheel loader
Other CAT machinery using part number 539-0117

FAQ

Q1: What is the function of this NOx sensor?
A1: It measures nitrogen oxide levels in engine exhaust and sends data to the emission control system for regulation.

Q2: Where is this sensor installed?
A2: It is installed in the engine exhaust emission monitoring system, typically upstream in the aftertreatment system.

Q3: Is part number matching required?
A3: Yes, exact part number matching is required because this sensor is application-specific.

Q4: Is this sensor used across multiple CAT machines?
A4: Yes, it is used across various Caterpillar engines and off-highway equipment platforms depending on emission configuration.

Q5: What are common failure symptoms?
A5: Engine warning light, emission system fault codes, or derated engine performance mode.