Safe to driveDrivable, but watch it yourself
SPN 4383 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by DAF, and what the second half of the code (FMI) means.
| FMI 3 | Exhaust gas temperature sensor downstream of catalyst F765 voltage too high at ECU pin B09 (extended period) |
| FMI 4 | Exhaust gas temperature sensor downstream of catalyst F765 voltage too low at ECU pin B09 (extended period) |
| FMI 16 | Exhaust gas temperature sensor downstream of catalyst F765 temperature too high |
| SPN 4383 FMI 34383/3 · 4383.3 | voltage above normal or shorted high |
| SPN 4383 FMI 44383/4 · 4383.4 | voltage below normal or shorted to ground |
| SPN 4383 FMI 164383/16 · 4383.16 | above normal — moderate severity |
Safe to drive. Below — how much time you have and what happens if you keep going.
This is an electrical fault: an open, a short or a bad contact in the sensor circuit. The value it measures is most likely fine.
You can drive. But until the circuit is repaired this system runs blind and cannot warn you about a real failure.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.