Home >> Volvo >> 2004 >> S80 Base, 2.5 59, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control Module (ECM) Diagnostic Trouble Codes - 5 Of 11 >> ECM-2A2A: Rear Heated Oxygen Sensor (Ho2S) Preheating. Signal Missing. Intermittent Fault (B6294S; 2000-2001) >> Signal missing. Intermittent fault