Mercedes-Benz Diesel Fault Codes
25 Mercedes-Benz diagnostic pages, grouped by the system the code belongs to. Each page covers symptoms, the tests to run in order, tools needed, and realistic parts and labor cost ranges.
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Aftertreatment (10)
- SPN 3226 FMI 3 — Outlet NOx Sensor
- SPN 3251 FMI 0 — DPF Differential Pressure Sensor
- SPN 3364 FMI 9 — DEF Quality Sensor
- SPN 4094 FMI 16 — DPF Soot Load
- SPN 4094 FMI 18 — DPF Soot Load Percent
- SPN 4358 FMI 18 — SCR Catalyst Exhaust Gas Differential Pressure
- SPN 4360 FMI 16 — SCR Intake Gas Temperature
- SPN 4364 FMI 17 — Aftertreatment #1 SCR Catalyst Conversion Efficiency
- SPN 5246 FMI 31 — SCR Operator Inducement
- SPN 524287 FMI 14 — Aftertreatment Diesel Particulate Filter
Fuel (5)
Air/Turbo (2)
Coolant (1)
Sensors/Other (7)
- SPN 100 FMI 1 — Engine Oil Pressure Sensor / Oil Pressure Circuit
- SPN 168 FMI 4 — Battery / Charging System Circuit
- SPN 175 FMI 3 — Engine Oil Temperature Sensor
- SPN 190 FMI 0 — Engine Speed Sensor Circuit
- SPN 636 FMI 2 — Crankshaft Position Sensor
- SPN 1209 FMI 3 — Exhaust Backpressure Sensor
- SPN 3509 FMI 3 — Sensor Supply Voltage 1 (5V Reference)