VOLVOUU All Engines (2010 Emissions) Fault Code: SPN 131 FMI 2 PID: Engine Exhaust Back Pressure

Conditions for diagnostic trouble code (DTC):
1) The engine brake is activated but the expected exhaust back pressure (EBP) is not achieved

Observable symptoms
1) Engine brake, poor brake performance/Brake performance too high

Probable cause
1) Exhaust back pressure sensor
2) Faulty connection
3) Air valve unit
4) Butterfly
5) Control valve, VCB
6) Leakage from hoses or connections