Home >> Volvo >> 2007 >> S40 Base, 2.4 38, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 1 Of 10 (544 Body) >> ECM-126B: Boost Pressure Sensor. Signal Too Low (B5254T3; 2005-2007) >> Signal Too High / Signal Too Low