Home >> Volvo >> 2002 >> S60 Base, 2.4 61, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control Module (ECM) - Diagnostic Trouble Codes And Associated Procedures - 8 Of 14 >> ECM-4801: Three-Way Catalytic Converter (TWC) Efficiency. Intermittent Fault (B5254T2; 2003-2004) >> Intermittent fault