NOx Sensor 539-0117 / A2C16102600-01 - For CAT Caterpillar Engines & Equipment, Direct Replacement

This is a nitrogen oxide sensor, part numbers 539-0117 and A2C16102600-01.

It's new other—meaning it's unused but might have imperfect packaging or be a factory second.

No signs of wear, though.

It fits a massive range of Caterpillar equipment: Wheel Loaders 950 GC, Excavators 313-330, Motor Graders 120, Backhoe Loaders 416-444, D6T dozers, industrial engines C4.4 to C18, and even generator sets.

Direct replacement, 1-year warranty.

UPC is 704768757052.

If your Cat is throwing emissions codes, this might be the fix.