9 Deutz diagnostic codes on file — with the full diagnosis, repair steps, and field insights open to read free, no signup required.
Disclaimer: General reference information for trained, qualified technicians only. Codes and procedures vary by model, serial number and software version. Always follow the manufacturer's service manual and your site's safety procedures. Use at your own risk. Not affiliated with or endorsed by any manufacturer.
| Code | System | Symptom | Full fix |
|---|---|---|---|
| Code 1-1-1 / SPN 94 FMI 1 | Fuel System | Engine Sags under Heavy Load / Stalls | View fix |
| Code 1-1-3 / SPN 157 FMI 18 | Fuel System | Limp Mode / Reduced Engine Output | View fix |
| Code 6-1-1 / SPN 651 FMI 5 | Fuel System | Dead Misfire Cylinder 1 / Engine Shake | View fix |
| Code 6-1-2 / SPN 652 FMI 5 | Fuel System | Dead Misfire Cylinder 2 / Engine Shake | View fix |
| Code 6-1-3 / SPN 653 FMI 5 | Fuel System | Dead Misfire Cylinder 3 / Engine Shake | View fix |
| Code 6-1-4 / SPN 654 FMI 5 | Fuel System | Dead Misfire Cylinder 4 / Engine Shake | View fix |
| P1088 | Fuel System | Severe Power Derate / Engine Stalls | View fix |
| P1089 | Fuel System | Hard Engine Misfire / Severe Derate | View fix |
| SPN 157 FMI 1 | — | Hard starting; Misfiring under load; Sudden engine stalling. | View fix |
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