Do not driveTo the nearest safe stop
J1939 code SPN 3222. Below — how the fault is worded at the factory by SITRAK, and what the second half of the code (FMI) means in the standard.
| FMI 0 | High resistance in UEGO sensor heater circuit |
| FMI 3 | High voltage on UEGO sensor armature |
| FMI 10 | Slow heat-up of UEGO sensor heater element |
| SPN 3222 FMI 03222/0 · 3222.0 | data above normal range (most severe level) |
| SPN 3222 FMI 33222/3 · 3222.3 | voltage above normal or shorted high |
| SPN 3222 FMI 103222/10 · 3222.10 | abnormal rate of change |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
The code is flagged critical: the manufacturer considers it unsafe to keep driving without checking.
This code alone cannot say what will fail next, so stop at the first safe opportunity and look at it on the spot.
That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.