Home >> Volvo >> 2004 >> S80 Base, 2.5 59, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control Module (ECM) Diagnostic Trouble Codes - 4 Of 11 >> ECM-280A: Front Heated Oxygen Sensor (Ho2S), Bank 1. Faulty Signal. Permanent Fault (B6284T; 1999-2001) >> Faulty signal. Permanent fault