2 Howo diagnostic codes on file. Each shows the symptom for free — unlock the full diagnosis, repair steps, and field insights with a free account.
| Code | System | Symptom | Fix |
|---|---|---|---|
| P0520 | Lubrication | Oil Warning Light On / Alarm Beep | Unlock |
| P204F | Emissions / DEF | AdBlue Light On / Torque Derate | Unlock |
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