Safe to driveDrivable, but watch it yourself
SPN 520208 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by KAMAZ, MAZ, SITRAK, Volvo and YaMZ, and what the second half of the code (FMI) means.
| FMI 2 | Exhaust gas mass flow sensor (CAN signal EngGsFlowRt) |
| FMI 3 | Exhaust gas mass flow sensor (CAN signal EngGsFlowRt) |
| FMI 4 | Exhaust gas mass flow sensor (CAN signal EngGsFlowRt) |
| FMI 12 | Exhaust gas mass flow sensor (CAN signal EngGsFlowRt) |
| FMI 2 | Exhaust gas mass flow signal error reported in CAN message ENGGSFLOWRT - Sensor error. Blink code: 4-3-3. Repair: Check the exhaust mass flow sensor and its wiring. |
| FMI 3 | Exhaust gas mass flow signal error reported in CAN message ENGGSFLOWRT - Sensor short to battery positive detected. Blink code: 4-3-3. Repair: Check the exhaust mass flow sensor and its wiring. |
| FMI 4 | Exhaust gas mass flow signal error reported in CAN message ENGGSFLOWRT - Sensor short to ground detected. Blink code: 4-3-3. Repair: Check the exhaust mass flow sensor and its wiring. |
| FMI 12 | Exhaust gas mass flow signal error reported in CAN message ENGGSFLOWRT - Open circuit in the sensor. Blink code: 4-3-3. Repair: Check the exhaust mass flow sensor and its wiring. |
| FMI 2 | Implausible exhaust brake flap feedback signal. Scan tool code: P0476. Effect: The engine brake is disabled. |
| FMI 3 | Exhaust brake flap actuator circuit short to battery. Scan tool code: P0478. |
| FMI 4 | Exhaust brake flap actuator circuit short to ground. Scan tool code: P0477. |
| FMI 5 | Over-temperature of the exhaust brake flap powerstage in the ECU. Scan tool code: P0475. |
| FMI 6 | Over-temperature of the exhaust brake flap powerstage in the ECU. Scan tool code: P0475. |
| FMI 19 | Over-temperature of the exhaust brake flap powerstage in the ECU. Scan tool code: P0475. |
| FMI 22 | Over-temperature of the low-pressure exhaust flap powerstage. Scan tool code: P0078. Effect: Torque limited, the engine may shut down. |
| FMI 5 | LCM output current to the lamp is below 0.1 A. Open supply wire between the LCM and the lamp, open wire between the lamp and the ground point, or lamp failure. |
| FMI 6 | LCM output current to the lamp is above 2.6 A. Wire shorted to ground between the LCM and the lamp. Possibly several lamps are connected, or a higher-wattage lamp is installed. |
| FMI 2 | Engine exhaust gas mass flow signal error reported via CAN message ENGGSFLOWRT (Sensor fault). Blink code: 4-3-3. Repair: Check the exhaust mass flow sensor and its wiring. |
| FMI 3 | Engine exhaust gas mass flow signal error reported via CAN message ENGGSFLOWRT (Short to battery positive detected in sensor). Blink code: 4-3-3. Repair: Check the exhaust mass flow sensor and its wiring. |
| FMI 4 | Engine exhaust gas mass flow signal error reported via CAN message ENGGSFLOWRT (Short to ground detected in sensor). Blink code: 4-3-3. Repair: Check the exhaust mass flow sensor and its wiring. |
| FMI 12 | Engine exhaust gas mass flow signal error reported via CAN message ENGGSFLOWRT (Open circuit in sensor). Blink code: 4-3-3. Repair: Check the exhaust mass flow sensor and its wiring. |
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.