Caterpillar Fault Code
Free · no signup3216-20
Regen Inop
System
Emissions
Symptom
Regen Inop
Diagnosis & fix steps
LOGIC: Intake NOx Sensor Drifted.
ACTION: Clean sensor probe of soot. Perform a "NOx Sensor Verification" test in ET.
Red Seal field insights
Logic: The sensor is reading "stale" or static data compared to the outlet sensor.
Track this across your whole fleet
This code is free to read. AM Fleet Integrity lets your team log fault codes against assets, plus the full fault-code library, QR operator reporting, PM scheduling and predictive alerts. Start free — no credit card required.
Start your free trial