Home >> Volvo >> 2007 >> S60 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) - Diagnostic Trouble Codes And Associated Procedures - 5 Of 14 >> ECM-2A0A: Rear Heated Oxygen Sensor (Ho2S). Signal Missing. Permanent Fault (B5234T3; 2001-2004) >> Signal missing. Permanent fault