Deutz Spn 523912 Fmi 1 Engine Fault Code
Check the description:Spn 523912 Fmi 1 Description:
"Physical range check low for burner dosing valve (DV2) downstream pressure; Shut off regeneration.When burner injector is actuated, the measured pressure does not rise above 1250mbar abs (expected: about 2400mbar)."