Home >> Volvo >> 2000 >> S80 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 5 Of 11 >> ECM-2A2A: Rear Heated Oxygen Sensor (Ho2S) Preheating. Signal Missing. Intermittent Fault (B6304S3; 1999) >> Signal missing. Intermittent fault