SPN 3216: Inlet NOx and Cummins FMI Examples
What SPN 3216 identifies
SPN 3216 identifies aftertreatment inlet NOx. It supplies an upstream reference for evaluating NOx reduction. 3226 concerns outlet NOx and 4364 concerns conversion efficiency. Identify the sensor in the engine's component diagram; a generic code name does not establish its exact physical location.
Documented SPN/FMI examples
Scroll horizontally to see the application and source.
| SPN / FMI | OEM FC | Meaning | Application / source |
|---|---|---|---|
3216 / 2 | 3228 | Erratic NOx data | Cummins 2013 ISX15/ISX12/ISL9/ISB6.7* Cummins SPN/FMI cross-reference — Atlas Copco |
3216 / 4 | 1885 | Low circuit voltage | Cummins 2013 ISX15/ISX12/ISL9/ISB6.7* Cummins SPN/FMI cross-reference — Atlas Copco |
3216 / 9 | 3232 | Irregular/missing updates | Cummins 2013 ISX15/ISX12/ISL9/ISB6.7* Cummins SPN/FMI cross-reference — Atlas Copco |
3216 / 20 | 3748 | High drift | Cummins 2013 ISX15/ISX12/ISL9/ISB6.7* Cummins SPN/FMI cross-reference — Atlas Copco |
Examples only; a dash means no separate FC is supplied here. *See source applicability below; a model name alone does not establish calibration coverage.
Establish whether the reading is usable
- Record the engine serial number, calibration, reporting controller and full fault list. The table is a set of documented 2013 Cummins examples, not a list for every manufacturer.
- Follow the applicable circuit or communication procedure before evaluating conversion using an unreliable inlet reading.
- For a performance investigation, capture inlet and outlet NOx with the load, temperatures and operating conditions required by the OEM test. A single snapshot does not establish catalyst condition.
- Document the evidence for the repair and repeat the specified verification. Do not replace both NOx sensors merely because their readings differ.
Sources and applicability
Source check: September 12, 2026. These are documented examples. Confirm the engine serial number, software calibration and current OEM instructions before using a test or repair procedure.
- Cummins SPN/FMI cross-reference — Atlas Copco — 2013 ISX15, ISX12, ISL9 and ISB6.7; use only the applications marked in the source table.
- Detroit 01 13-16 (January 2016) — GHG14/GHG17 DD platform: 4364/18 and 4374/0; DDC-SVC-MAN-0084 and 0191.
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