Safe to driveDrivable, but watch it yourself
SPN 4380 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 2 | Exhaust gas temperature sensor upstream of catalyst F766 implausible temperature (extended period) |
| FMI 3 | Exhaust gas temperature sensor upstream of catalyst F766 voltage too high at ECU pin B38 (extended period) |
| FMI 4 | Exhaust gas temperature sensor upstream of catalyst F766 voltage too low at ECU pin B50 (extended period) |
| FMI 13 | Exhaust gas temperature sensor upstream of catalyst F766 swapped with downstream exhaust gas temperature sensor F765 |
| FMI 15 | Exhaust gas temperature sensor upstream of catalyst F766 temperature too high |
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.