Home >> Volvo >> 2004 >> S80 Base, 2.5 59, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 2 Of 11 >> ECM-121B: Mass Air Flow (MAF) Sensor. Flow Too Low (B5254T2; 2005-2006) >> Flow too low or too high