Scania Fault Codes — Complete Guide

Scania SPN/FMI codes cover DC13, DC16. This hub lists 26 diagnostic pages with symptoms, ranked causes, scan-tool steps, and 2026 repair costs — use INSITE, DiagnosticLink, or EST depending on your engine family.

By Professional Diesel Repair TeamPublished: January 2026Last updated: September 2026

How We Tested and Verified

Scania fault code definitions cross-checked against SAE J1939-71 and Scania OEM service bulletins. Diagnostic tips validated by field technicians September 2026.

Scania Engine Platforms

Scania engines covered on this site include: DC13, DC16. Diagnostic procedures vary by platform — always verify against your specific engine serial number and calibration.

Most Common Scania Fault Codes

Code	Component	Severity	Definition
SPN 100 FMI 1	Engine Oil Pressure Sensor	Critical	Engine Oil Pressure - Data Valid But Below Normal Operating Range - Most Severe Level
SPN 111 FMI 1	Engine Coolant Level Sensor	Critical	Engine Coolant Level - Data Valid But Below Normal Operating Range
SPN 190 FMI 0	Engine Speed Sensor Circuit	Critical	Engine Speed - Data Valid But Above Normal Operational Range
SPN 4364 FMI 18	SCR NOx Conversion Efficiency	Critical	SCR NOx Conversion Efficiency - Data Valid But Below Normal Operational Range - Moderately Severe Level
SPN 5246 FMI 31	SCR Operator Inducement	Critical	Aftertreatment 1 SCR Operator Inducement - Severe Level
SPN 94 FMI 1	Fuel Delivery Pressure Sensor	Critical	Engine Fuel Delivery Pressure - Data Valid But Below Normal Operational Range - Most Severe Level
SPN 132 FMI 1	Inlet Air Mass Flow / MAF Sensor Circuit	High	Inlet Air Mass Flow Rate - Data Valid But Below Normal Operating Range - Moderately Severe Level
SPN 1382 FMI 0	Fuel Filter Differential Pressure Sensor	High	Engine Fuel Filter (Suction Side) Differential Pressure - Data Valid But Above Normal Operational Range - Most Severe Level
SPN 168 FMI 1	Battery / ECU Power Supply Voltage	High	Electrical Potential (Voltage) - Data Valid But Below Normal Operating Range
SPN 3031 FMI 10	EGR Valve	High	EGR Valve Control Circuit - High Resistance
SPN 3363 FMI 1	DEF Tank Heater	High	Aftertreatment 1 Diesel Exhaust Fluid Tank Heater - Data Valid But Below Normal Operational Range - Most Severe Level
SPN 3364 FMI 3	DEF Dosing Unit	High	Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit - Voltage Above Normal (FMI 3)
SPN 3364 FMI 9	DEF Quality Sensor	High	Aftertreatment 1 DEF Tank - Liquid Quality Parameter - Abnormal Update Rate
SPN 4358 FMI 3	SCR Catalyst Exhaust Differential Pressure	High	Aftertreatment 1 SCR Catalyst Exhaust Gas Differential Pressure - Voltage Above Normal
SPN 4766 FMI 3	DOC Outlet Gas Temperature Sensor	High	DOC outlet gas temperature sensor voltage above normal — FMI 3 high-voltage fault on the aftertreatment diesel oxidation catalyst outlet thermistor circuit.
SPN 512 FMI 3	Driver Demand Percent Torque	High	Driver Demand Percent Torque - Voltage Above Normal
SPN 641 FMI 5	VGT Actuator Circuit	High	Variable Geometry Turbocharger Actuator - Current Below Normal or Open Circuit
SPN 652 FMI 5	Injector Cylinder #2	High	Engine Injector Cylinder #02 - Current Below Normal Or Open Circuit
SPN 656 FMI 5	Fuel Injector #6 Solenoid/Driver Circuit	High	Engine Injector Cylinder #6 - Current Below Normal or Open Circuit
SPN P0101 FMI N/A	Mass Air Flow Sensor	Medium	Mass Air Flow (MAF) Circuit Range/Performance Problem

Scania-Specific Diagnostic Tips

Scania SDP3 (Scania Diagnos & Programmer) shows EGR and SCR efficiency side by side.
DC13 VGT actuator failures often follow coolant leaks onto the turbo pedestal.
Check AdBlue tank heater fuse before condemning quality sensor on European-spec trucks.