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 - 7 Of 14 >> ECM-4201: Three-Way Catalytic Converter (TWC) Efficiency. Power Deterioration (B5244S6; 2003-2006) >> Power deterioration