Question 1

What does Scania fault code 11181 (SPN 102 FMI 2) mean?

Accepted Answer

11181 (SPN 102 FMI 2): Engine derate (Torque reduction); High fuel consumption; "Lazy" turbo response. Fix: Charge Air Pressure (Boost) Implausible.

LOGIC: The ECM compares the Boost sensor to the Baro sensor at key-on. If they differ by more than 50 mbar, it triggers a fault.

ACTION: 1. Remove boost sensor and check for oil/soot clogging. 
2. Verify VGT actuator movement. 
3. Check for intake leaks at the rubber boots.

FIX: Clean or replace the Charge Air Pressure Sensor.

Question 2

What does Scania fault code 135 (SPN 110 FMI 3) mean?

Accepted Answer

135 (SPN 110 FMI 3): Fan running at max speed; Cold start enrichment active while hot; High temp alarm. Fix: Coolant Temp Sensor Voltage High.

LOGIC: Signal > 4.5V (Open Circuit). The ECM assumes a "fail-safe" cold value, causing the engine to over-fuel and the fan to lock on.

ACTION: 1. Unplug sensor and bridge pins (Jumper Test). If code changes to FMI 4, wiring is good. 
2. Inspect the harness where it passes near the thermostat housing.

FIX: Replace Coolant Temp Sensor or repair wire break at the plug.

Question 3

What does Scania fault code 4097 (SPN 3216 FMI 20) mean?

Accepted Answer

4097 (SPN 3216 FMI 20): Frequent DPF regens; High DEF consumption; Power derate. Fix: NOx Sensor 1 (Inlet) Drifted High.

LOGIC: The sensor is reading a higher level of NOx than the ECM calculates should be possible based on engine load.

ACTION: 1. Check for exhaust leaks before the SCR catalyst. 
2. Inspect the sensor tip for white "crystal" (DEF) buildup. 
3. Check the sensor module CAN wiring.

FIX: Repair exhaust leaks or replace the NOx Sensor.

Question 4

What does Scania fault code 4358 (SPN 520202) mean?

Accepted Answer

4358 (SPN 520202): Engine "hunting" at idle; Sudden power drop; White smoke; Surging under load. Fix: LOGIC: Fuel Pressure Control Valve (IMV/MPROP) current too high or low. The EEC3 controller cannot maintain stable rail pressure.

ACTION: 1. Check the 2-pin connector on the high-pressure pump. 
2. Measure resistance of the solenoid (should be approx. 2-5 Ohms). 
3. Check for fuel leaks at the return lines.

FIX: Replace the Fuel Volume Control Valve (IMV) or repair the harness pigtail.

Question 5

What does Scania fault code 8210 (SPN 651-658) mean?

Accepted Answer

8210 (SPN 651-658): Heavy engine vibration; Metallic knocking; Misfire; "Check Engine" lamp. Fix: Injector Solenoid Fault (Cylinder specific).

LOGIC: Open circuit or short in the XPI (Extra High Pressure Injection) injector solenoid.

ACTION: 1. Identify which cylinder (651=1, 652=2, etc.). 
2. Remove the valve cover. 
3. Check the small 7mm nuts on the injector terminals for looseness.

FIX: Tighten injector terminals or replace the specific XPI Injector.

Question 6

What does Scania fault code SPN 91 FMI 19 mean?

Accepted Answer

SPN 91 FMI 19 (Communication): Engine Idles Only / Dash Malfunction Fix: LOGIC: Received Network Data Error from Throttle Pedal System (CAN Link). ACTION: Test termination resistance across the Coordinator (COO) module link lines. Inspect the twisted harness running past the cab tilt hinge area.

Scania Fault Codes

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Code	System	Symptom	Full fix
11181 (SPN 102 FMI 2)	—	Engine derate (Torque reduction); High fuel consumption; "Lazy" turbo response.	View fix
135 (SPN 110 FMI 3)	—	Fan running at max speed; Cold start enrichment active while hot; High temp alarm.	View fix
4097 (SPN 3216 FMI 20)	—	Frequent DPF regens; High DEF consumption; Power derate.	View fix
4358 (SPN 520202)	—	Engine "hunting" at idle; Sudden power drop; White smoke; Surging under load.	View fix
8210 (SPN 651-658)	—	Heavy engine vibration; Metallic knocking; Misfire; "Check Engine" lamp.	View fix
SPN 91 FMI 19	Communication	Engine Idles Only / Dash Malfunction	View fix