Home >> Volvo >> 2007 >> S40 Base, 2.4 39, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 4 Of 10 (544 Body) >> ECM-28AA: Front Heated Oxygen Sensor (Ho2S), Bank 1. Signal Too High (B5254T3; 2004) >> Signal Too High / Signal Too Low